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画像セクションで画像が大きすぎる場合、画像のサイズを変更しようとしています。私はコードを書きましたが、imagepngを使用する場合を除いて、ランダムな文字と記号が表示されるだけです。なぜそれが問題を引き起こしているのか完全にはわかりません。過去にこの問題が発生したことを覚えていますが、修正されたことはありません。

ResizeImage クラス:

        class ResizeImage{
        private $image;
        private $imageResized;
        private $width;
        private $height;
        private $imageSupport;
        private $imageType;

        public function __construct($image){
            $this->imageSupport = array("jpg", "jpeg", "png", "gif");
            $this->image = $this->openImage($image);
            $this->width = imagesx($this->image);
            $this->height = imagesy($this->image);
        }

        private function openImage($file){
            $fileTypeSize = explode(".", $file);
            $this->imageType = $fileTypeSize[count($fileTypeSize) - 1];
            switch($this->imageType){
                case 'jpg':
                case 'jpeg':
                    $image = imagecreatefromjpeg($file);
                    break;
                case 'gif':
                    $image = imagecreatefromgif($file);
                    break;
                case 'png':
                    $image = imagecreatefrompng($file);
                    break;
                default:
                    $image = false;
                    break;
            }
            return $image;
        }

        public function resizeImage($newWidth, $newHeight, $option="auto"){
            //Get optimal size based on $option
            $optionArray = $this->getDimensions($newWidth, $newHeight, strtolower($option));

            $optimalWidth = $optionArray['optimalWidth'];
            $optimalHeight = $optionArray['optimalHeight'];

            $this->imageResized = imagecreatetruecolor($optimalWidth, $optimalHeight);
            imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $optimalWidth, $optimalHeight, $this->width, $this->height);

            if($option == 'crop'){
                $this->crop($optimalWidth, $optimalHeight, $newWidth, $newHeight);
            }
        }

        private function getDimensions($newWidth, $newHeight, $option){
           switch ($option)  
            {  
                case 'exact':  
                    $optimalWidth = $newWidth;  
                    $optimalHeight = $newHeight;  
                    break;  
                case 'portrait':  
                    $optimalWidth = $this->getSizeByFixedHeight($newHeight);  
                    $optimalHeight = $newHeight;  
                    break;  
                case 'landscape':  
                    $optimalWidth = $newWidth;  
                    $optimalHeight = $this->getSizeByFixedWidth($newWidth);  
                    break;  
                case 'auto':  
                    $optionArray = $this->getSizeByAuto($newWidth, $newHeight);  
                    $optimalWidth = $optionArray['optimalWidth'];  
                    $optimalHeight = $optionArray['optimalHeight'];  
                    break;  
                case 'crop':  
                    $optionArray = $this->getOptimalCrop($newWidth, $newHeight);  
                    $optimalWidth = $optionArray['optimalWidth'];  
                    $optimalHeight = $optionArray['optimalHeight'];  
                    break;  
            }  
            return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);  
        } 

        private function getSizeByFixedHeight($newHeight)  
        {  
            $ratio = $this->width / $this->height;  
            $newWidth = $newHeight * $ratio;  
            return $newWidth;  
        }  

        private function getSizeByFixedWidth($newWidth)  
        {  
            $ratio = $this->height / $this->width;  
            $newHeight = $newWidth * $ratio;  
            return $newHeight;  
        }  

        private function getSizeByAuto($newWidth, $newHeight)  
        {  
            if ($this->height < $this->width)  
            // *** Image to be resized is wider (landscape)  
            {  
                $optimalWidth = $newWidth;  
                $optimalHeight= $this->getSizeByFixedWidth($newWidth);  
            }  
            elseif ($this->height > $this->width)  
            // *** Image to be resized is taller (portrait)  
            {  
                $optimalWidth = $this->getSizeByFixedHeight($newHeight);  
                $optimalHeight= $newHeight;  
            }  
            else  
            // *** Image to be resizerd is a square  
            {  
                if ($newHeight < $newWidth) {  
                    $optimalWidth = $newWidth;  
                    $optimalHeight= $this->getSizeByFixedWidth($newWidth);  
                } else if ($newHeight > $newWidth) {  
                    $optimalWidth = $this->getSizeByFixedHeight($newHeight);  
                    $optimalHeight= $newHeight;  
                } else {  
                    // *** Sqaure being resized to a square  
                    $optimalWidth = $newWidth;  
                    $optimalHeight= $newHeight;  
                }  
            }  

            return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);  
        }  

        private function getOptimalCrop($newWidth, $newHeight){
            $heightRatio = $this->height / $newHeight;  
            $widthRatio  = $this->width /  $newWidth;  

            if ($heightRatio < $widthRatio) {  
                $optimalRatio = $heightRatio;  
            } else {  
                $optimalRatio = $widthRatio;  
            }  

            $optimalHeight = $this->height / $optimalRatio;  
            $optimalWidth  = $this->width  / $optimalRatio;  

            return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);  
        }  

        private function crop($optimalWidth, $optimalHeight, $newWidth, $newHeight)  
        {  
            // *** Find center - this will be used for the crop  
            $cropStartX = ( $optimalWidth / 2) - ( $newWidth /2 );  
            $cropStartY = ( $optimalHeight/ 2) - ( $newHeight/2 );  

            $crop = $this->imageResized;  
            //imagedestroy($this->imageResized);  

            // *** Now crop from center to exact requested size  
            $this->imageResized = imagecreatetruecolor($newWidth , $newHeight);  
            imagecopyresampled($this->imageResized, $crop , 0, 0, $cropStartX, $cropStartY, $newWidth, $newHeight , $newWidth, $newHeight);  
        }  

        public function saveImage($savePath, $imageQuality="100"){
            $fileType = $this->imageType;
            switch($fileType)  
            {  
                case '.jpg':  
                case '.jpeg':  
                    if (imagetypes() & IMG_JPG) {  
                        imagejpeg($this->imageResized, $savePath, $imageQuality);  
                    }  
                    break;  

                case '.gif':  
                    if (imagetypes() & IMG_GIF) {  
                        imagegif($this->imageResized, $savePath);  
                    }  
                    break;  

                case '.png':  
                    // *** Scale quality from 0-100 to 0-9  
                    $scaleQuality = round(($imageQuality/100) * 9);  

                    // *** Invert quality setting as 0 is best, not 9  
                    $invertScaleQuality = 9 - $scaleQuality;  

                    if (imagetypes() & IMG_PNG) {  
                        imagepng($this->imageResized, $savePath, $invertScaleQuality);  
                    }  
                    break;  

                // ... etc  

                default:  
                    // *** No extension - No save.  
                    break;  
            }  

            imagedestroy($this->imageResized);  
        }  

        public function loadImage(){
            $image;
            switch($this->imageType){
                case 'jpeg':
                case 'jpg':
                    $image = imagejpeg($this->imageResized);
                    break;
                case 'png':
                    $image = imagepng($this->imageResized);
                    break;
                case 'gif':
                    $image = imagegif($this->imageResized);
                    break;
                default:
                    $image = false;
            }

            return $image;
        }
    }

コード内で loadImage() を呼び出しています。今、私が得ている出力は次のとおりです。

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何か案は？お時間をいただきありがとうございます。=)

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Content-Typeヘッダーを画像としてレンダリングするには、ヘッダーをブラウザーに送信する必要があります。何かを出力する前に、次を追加してみてください。

header('Content-Type: image/png');

より良い参照のために、imagepngドキュメントのサンプルコードでその使用法を確認することもできます。

于 2012-09-17T18:12:54.777 に答える