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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Webino (https://github.com/webino/)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link      https://github.com/webino/WebinoImageThumb/ for the canonical source repository  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright Copyright (c) 2013-2014 Webino, s. r. o. (http://webino.sk/)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license   BSD-3-Clause  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace WebinoImageThumb\PhpThumb\Plugin;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use PHPThumb\GD as PHPThumb;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Crop a whitespace around image  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Peter Bačinský <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class WhitespaceCropper implements \PHPThumb\PluginInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var int  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $margin = 0;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var int  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $color = 0xFFFFFF;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param int $margin  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param int $color  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function __construct($margin = 0, $color = null)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        empty($margin)  or $this->margin = $margin;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        is_null($color) or $this->color  = $color;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param PHPThumb $phpthumb  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return PHPThumb  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function execute($phpthumb)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $currentDimensions = $phpthumb->getCurrentDimensions();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $oldImage          = $phpthumb->getOldImage();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $borderTop = 0;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        for (; $borderTop < imagesy($oldImage); ++$borderTop) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            for ($x = 0; $x < imagesx($oldImage); ++$x) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                if (imagecolorat($oldImage, $x, $borderTop) !== $this->color) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $borderTop -= $this->margin;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    break 2;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $borderBottom = 0;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        for (; $borderBottom < imagesy($oldImage); ++$borderBottom) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            for ($x = 0; $x < imagesx($oldImage); ++$x) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                if (imagecolorat($oldImage, $x, imagesy($oldImage) - $borderBottom - 1) != $this->color) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $borderBottom -= $this->margin;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    break 2;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $borderLeft = 0;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        for (; $borderLeft < imagesx($oldImage); ++$borderLeft) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            for ($y = 0; $y < imagesy($oldImage); ++$y) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                if (imagecolorat($oldImage, $borderLeft, $y) !== $this->color) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $borderLeft -= $this->margin;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    break 2;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $borderRight = 0;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        for (; $borderRight < imagesx($oldImage); ++$borderRight) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            for ($y = 0; $y < imagesy($oldImage); ++$y) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                if (imagecolorat($oldImage, imagesx($oldImage) - $borderRight - 1, $y) !== $this->color) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $borderRight -= $this->margin;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    break 2;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $width        = imagesx($oldImage) - ($borderLeft + $borderRight);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $height       = imagesy($oldImage) - ($borderTop + $borderBottom);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $workingImage = imagecreatetruecolor($width, $height);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        imagecopy(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $workingImage,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $oldImage,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            0,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            0,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $borderLeft,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $borderTop,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $width,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $height  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $phpthumb->setOldImage($workingImage);  | 
            
                            
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                        $currentDimensions['width']  = $width;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $currentDimensions['height'] = $height;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $phpthumb->setCurrentDimensions($currentDimensions);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $phpthumb;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: