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                <?php  | 
            
                            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @title          Captcha Class  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @desc           Generates a captcha and manages the display of the image.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author         Pierre-Henry Soria <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright      (c) 2012-2018, Pierre-Henry Soria. All Rights Reserved.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license        GNU General Public License; See PH7.LICENSE.txt and PH7.COPYRIGHT.txt in the root directory.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package        PH7 / Framework / Security / Spam / Captcha  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @version        0.9  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace PH7\Framework\Security\Spam\Captcha;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                defined('PH7') or exit('Restricted access'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use PH7\Framework\Navigation\Browser;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use PH7\Framework\Session\Session;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use PH7\Framework\Util\Various;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Captcha  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var Session */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $oSession;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var Str */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $sStr;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var string */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $sFont;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var int */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $iStringWidth;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var int */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $iHeight;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var int */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $iWidth;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var int */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $iSize = 36;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var int */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $iMargin = 25;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var array */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $aBox;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var array */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static $aMatrixBlur = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        [1, 1, 1],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        [1, 1, 1],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        [1, 1, 1]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var array */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $aColor = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var resource */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $rImg;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var resource */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $rBlack;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var resource */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $rRed;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /** @var resource */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $rWhite;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->oSession = new Session;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Show the captcha image.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param int $iRandom  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function show($iRandom = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!empty($iRandom)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->sStr = Various::genRnd($iRandom, 5);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->sStr = Various::genRnd('pH7_Pierre-Henry_Soria_Sanz_González_captcha', 5); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->oSession->set('rand_code', $this->sStr); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->sFont = $this->getFont();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        //$sBackground = PH7_PATH_DATA . 'background/' . mt_rand(1, 5) . '.png';  | 
            
                            
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                        $this->aBox = imagettfbbox($this->iSize, 0, $this->sFont, $this->sStr);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->iWidth = $this->aBox[2] - $this->aBox[0];  | 
            
                            
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                        $this->iHeight = $this->aBox[1] - $this->aBox[7];  | 
            
                            
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                        unset($this->aBox);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->iStringWidth = round($this->iWidth / strlen($this->sStr));  | 
            
                            
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                        //$this->rImg = imagecreatefrompng($sBackground);  | 
            
                            
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                        $this->rImg = imagecreate($this->iWidth + $this->iMargin, $this->iHeight + $this->iMargin);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->aColor = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            imagecolorallocate($this->rImg, 0x99, 0x00, 0x66),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            imagecolorallocate($this->rImg, 0xCC, 0x00, 0x00),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            imagecolorallocate($this->rImg, 0x00, 0x00, 0xCC),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            imagecolorallocate($this->rImg, 0x00, 0x00, 0xCC),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            imagecolorallocate($this->rImg, 0xBB, 0x88, 0x77)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->rBlack = imagecolorallocate($this->rImg, 0, 0, 0);  | 
            
                            
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                        $this->rRed = imagecolorallocate($this->rImg, 200, 100, 90);  | 
            
                            
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                        $this->rWhite = imagecolorallocate($this->rImg, 255, 255, 255);  | 
            
                            
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                        imagefilledrectangle($this->rImg, 0, 0, 399, 99, $this->rWhite);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->mixing();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        imageline($this->rImg, mt_rand(2, $this->iWidth + $this->iMargin), mt_rand(1, $this->iWidth + $this->iMargin), mt_rand(1, $this->iHeight + $this->iMargin), mt_rand(2, $this->iWidth + $this->iMargin), $this->rBlack);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        imageline($this->rImg, mt_rand(2, $this->iHeight + $this->iMargin), mt_rand(1, $this->iHeight + $this->iMargin), mt_rand(1, $this->iWidth + $this->iMargin), mt_rand(2, $this->iHeight + $this->iMargin), $this->rRed);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        imageline($this->rImg, mt_rand(2, $this->iHeight + $this->iMargin), mt_rand(1, $this->iWidth + $this->iMargin), mt_rand(1, $this->iWidth + $this->iMargin), mt_rand(2, $this->iHeight + $this->iMargin), $this->aColor[array_rand($this->aColor)]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    125
                 | 
                                    
                                                     | 
                
                 | 
                        unset($this->rBlack, $this->rRed, $this->rWhite);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    126
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    127
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    128
                 | 
                                    
                                                     | 
                
                 | 
                        imageconvolution($this->rImg, self::$aMatrixBlur, 9, 0);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    129
                 | 
                                    
                                                     | 
                
                 | 
                        imageconvolution($this->rImg, self::$aMatrixBlur, 9, 0);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    130
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    131
                 | 
                                    
                                                     | 
                
                 | 
                        (new Browser)->noCache();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    132
                 | 
                                    
                                                     | 
                
                 | 
                        header('Content-type: image/png'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    133
                 | 
                                    
                                                     | 
                
                 | 
                        imagepng($this->rImg);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    134
                 | 
                                    
                                                     | 
                
                 | 
                        imagedestroy($this->rImg);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    135
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    136
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    137
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    138
                 | 
                                    
                                                     | 
                
                 | 
                     * @param string $sCode The random code.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    140
                 | 
                                    
                                                     | 
                
                 | 
                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    141
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    142
                 | 
                                    
                                                     | 
                
                 | 
                    public function check($sCode)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    143
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    144
                 | 
                                    
                                                     | 
                
                 | 
                        if ($sCode === null) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    145
                 | 
                                    
                                                     | 
                
                 | 
                            return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    147
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    148
                 | 
                                    
                                                     | 
                
                 | 
                        if ($sCode === $this->oSession->get('rand_code')) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    149
                 | 
                                    
                                                     | 
                
                 | 
                            return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    150
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    151
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    152
                 | 
                                    
                                                     | 
                
                 | 
                        return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    153
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    154
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    155
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    156
                 | 
                                    
                                                     | 
                
                 | 
                     * The HTML code for displaying the captcha.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    157
                 | 
                                    
                                                     | 
                
                 | 
                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    158
                 | 
                                    
                                                     | 
                
                 | 
                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    159
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    160
                 | 
                                    
                                                     | 
                
                 | 
                    public function display()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    161
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    162
                 | 
                                    
                                                     | 
                
                 | 
                        // Md5 parameter in the img tag to the captcha that the browser does not cache the captcha  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    163
                 | 
                                    
                                                     | 
                
                 | 
                        echo // The captcha stylesheet that is now in the file form.css  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    164
                 | 
                                    
                                                     | 
                
                 | 
                        '<div class="center">  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    165
                 | 
                                    
                                                     | 
                
                 | 
                           <img class="border captcha" src="', PH7_URL_ROOT, 'asset/file/captcha/?r=', md5(time()), '" id="captcha" alt="Captcha Image" />  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    166
                 | 
                                    
                                                     | 
                
                 | 
                           <a class="captcha_button" href="#" onclick="document.getElementById(\'captcha\').src =\'', PH7_URL_ROOT, 'asset/file/captcha/?r=\' + Math.random(); return false"><img src="', PH7_URL_STATIC, PH7_IMG, 'icon/reload.png" onclick="this.blur()" id="refresh" alt="Refresh Image" title="Refresh Image" /></a>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    167
                 | 
                                    
                                                     | 
                
                 | 
                         </div>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    168
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    169
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    170
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    171
                 | 
                                    
                                                     | 
                
                 | 
                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    172
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    173
                 | 
                                    
                                                     | 
                
                 | 
                    private function mixing()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    174
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    175
                 | 
                                    
                                                     | 
                
                 | 
                        for ($i = 0, $iLength = strlen($this->sStr); $i < $iLength; ++$i) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    176
                 | 
                                    
                                                     | 
                
                 | 
                            $sText = $this->sStr[$i]; // A string can be seen as an array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    177
                 | 
                                    
                                                     | 
                
                 | 
                            $iAngle = mt_rand(-70, 70);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    178
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    179
                 | 
                                    
                                                     | 
                
                 | 
                            imagettftext(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    180
                 | 
                                    
                                                     | 
                
                 | 
                                $this->rImg,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    181
                 | 
                                    
                                                     | 
                
                 | 
                                mt_rand($this->iSize / 2, $this->iSize),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    182
                 | 
                                    
                                                     | 
                
                 | 
                                $iAngle,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    183
                 | 
                                    
                                                     | 
                
                 | 
                                ($i * $this->iStringWidth) + $this->iMargin,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    184
                 | 
                                    
                                                     | 
                
                 | 
                                $this->iHeight + mt_rand(1, $this->iMargin / 2),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    185
                 | 
                                    
                                                     | 
                
                 | 
                                $this->aColor[array_rand($this->aColor)],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    186
                 | 
                                    
                                                     | 
                
                 | 
                                $this->sFont,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    187
                 | 
                                    
                                                     | 
                
                 | 
                                $sText  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    188
                 | 
                                    
                                                     | 
                
                 | 
                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    189
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    190
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    191
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    192
                 | 
                                    
                                                     | 
                
                 | 
                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    193
                 | 
                                    
                                                     | 
                
                 | 
                     * @return string The font path of captcha.  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    194
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                        
            
                                    
            
            
                | 
                    195
                 | 
                                    
                                                     | 
                
                 | 
                    private function getFont()  | 
            
            
                                                        
            
                                    
            
            
                | 
                    196
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                        
            
                                    
            
            
                | 
                    197
                 | 
                                    
                                                     | 
                
                 | 
                        //$count = count(glob(PH7_PATH_DATA . '/font/*.ttf'));  | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                        
            
                                    
            
            
                | 
                    198
                 | 
                                    
                                                     | 
                
                 | 
                        //return PH7_PATH_DATA . '/font/' . mt_rand(1,$count) . '.ttf';  | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                        
            
                                    
            
            
                | 
                    199
                 | 
                                    
                                                     | 
                
                 | 
                        return PH7_PATH_DATA . '/font/4.ttf';  | 
            
            
                                                        
            
                                    
            
            
                | 
                    200
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    201
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    202
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.