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                <?php  | 
            
                            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 You may not change or alter any portion of this comment or credits  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 of supporting developers from this source code or any supporting source code  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 which is considered copyrighted (c) material of the original comment or credit authors.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 This program is distributed in the hope that it will be useful,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 but WITHOUT ANY WARRANTY; without even the implied warranty of  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Xmf\Request;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Xmf\IPAddress;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * CAPTCHA for Recaptcha mode  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package     class  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @subpackage  CAPTCHA  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author      Grégory Mage  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright   2016 XOOPS Project (http://xoops.org)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license     GNU GPL 2 or later (http://www.gnu.org/licenses/gpl-2.0.html)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link        http://xoops.org  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                defined('XOOPS_ROOT_PATH') || exit('Restricted access'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class XoopsCaptchaRecaptcha2  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class XoopsCaptchaRecaptcha2 extends XoopsCaptchaMethod  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * XoopsCaptchaRecaptcha2::isActive()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function isActive()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * XoopsCaptchaRecaptcha2::render()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return string  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function render()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $form = '<script src="https://www.google.com/recaptcha/api.js"></script>';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $form .= '<div class="form-group"><div class="g-recaptcha" data-sitekey="'  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            . $this->config['website_key'] . '"></div></div>';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $form;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * XoopsCaptchaRecaptcha2::verify()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string|null $sessionName unused for recaptcha  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function verify($sessionName = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $isValid = false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $recaptchaResponse = Request::getString('g-recaptcha-response', ''); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $recaptchaVerifyURL = 'https://www.google.com/recaptcha/api/siteverify?secret=' . $this->config['secret_key']  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            . '&response=' .  $recaptchaResponse . '&remoteip=' . IPAddress::fromRequest()->asReadable();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $usedCurl = false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (function_exists('curl_init') && false !== ($curlHandle  = curl_init())) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            curl_setopt($curlHandle, CURLOPT_URL, $recaptchaVerifyURL);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            curl_setopt($curlHandle, CURLOPT_FAILONERROR, true);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            curl_setopt($curlHandle, CURLOPT_RETURNTRANSFER, 1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            curl_setopt($curlHandle, CURLOPT_CONNECTTIMEOUT, 5);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $curlReturn = curl_exec($curlHandle);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (false === $curlReturn) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                trigger_error(curl_error($curlHandle));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $usedCurl = true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $recaptchaCheck = json_decode($curlReturn, true);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            curl_close($curlHandle);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (false === $usedCurl) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $recaptchaCheck = file_get_contents($recaptchaVerifyURL);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $recaptchaCheck = json_decode($recaptchaCheck, true);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (isset($recaptchaCheck['success']) && $recaptchaCheck['success'] === true) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $isValid = true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            /** @var \XoopsCaptcha $captchaInstance */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $captchaInstance = \XoopsCaptcha::getInstance();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            /** @var array $recaptchaCheck */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($recaptchaCheck['error-codes'] as $msg) { | 
            
                            
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                                $captchaInstance->message[] = $msg;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $isValid;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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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.