使用imagepng时，它显示符号和随机字符，但没有图像

时间：2012-09-17 18:10:43

标签： php image oop gd

如果图像部分太大，我正在尝试调整图像大小。我已经编写了代码并且我已经完成了，除非我使用imagepng它只会显示随机字符和符号。我不完全理解为什么会导致这个问题。我记得过去曾经遇到这个问题而且从来没有修好过。

ResizeImage类：

        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;
        }
    }

我在我的代码中调用loadImage（）。现在我得到的输出是。

    ‰PNG  IHDR–ps~* IDATxœí}ypÇyï×=ÇÞXìâ¾II¼‰4)ò‰:-+:[–”<Ù)Ee=;©g§Ê±c;ò{%_e»R±¥ø%O±äg˧$G’Y’©H"­ƒ¤xAI‰Å]ì½;WïÙ=È"ªÐ5µ˜éùMwOýõïûº{‘¦PS&,pá³`~¼Lj‹\ ©Ç#"5¢ qzŒ!ãòá=€çÞ³ü.sÖ—\FÒF<-zÛxòeƒˆf!ž_\ê·hj"Š5¬+lQ\0`a¡™c,-¢°\\¦õýR€K•|q‚KÅä%²Ä…‹¼Ä…—/ë%.\âÂ%.¼Bèm‰ç'½Í¼Ä…—/ë%.\âÂ%.¼Bèm‰ç'½Í¼Ä…—/ë…âBR¦ÒÍÏ2‡ dŽàR¿¥R˜…ÓçgggSƒXio­s¯«´·‹¦lÜK™/3¸¨8K¾ŒØ cÁ—e/ žUBÞúƒ/ ü«¤Æ A@xξ¹ñþ55·éÕ\¶¹¤¼ààR1@.DÄsÁß¿qþ{ˆ€A@i°¡æþ-Ëî.¬ÁÂD`‰Š“JðHàߘ.?@zAPŽ~b|f hït™Ë9_ð\¸ð⎄ßL)@=SÐ3ÎDôýFUU£HEÓ,l….Õyš¿0’A$Æ#-Dmthìäììl™’MyÁÁ¥b̉ðæX³i`yr.ü'‚õ2 0U““JPÖ’€(pv‡P%p´0Aa2$T§vù1Þ7Fü~?Çq¥ P¾r%úRÃTDDÞ[4é9šïl)¨¬Å/„ßê¾Lô),ÉPB8ŽÚ|ö¶öªkÛý{‚¯hún±‰þö"BÒIuvŒDÂÆÏ[ðy•ó2ƒçÂ…åÞǬ—†ýùíÅr~QpÑ_6zõèèÑô˜‘9d’Ò4-1•8=ï=ø醦O¬©ý3³[²®wmÒ$;'ÊÀP7Fum¤dàdŒE;DQ,UCt²¼h™/¸Œkž–z}è{ÿ5ðHzLW$$€ÑêôÒ,òvà_ÿãØ¢‰iú\Muì†T\£ ɤÀ‹d*9æj®_Q__oô¢$.¤–ØËÉ… ©±—ú¾Ú7ý¢©YS2〹Q!Bœï}êèßÎDæVI)·©ý6epÓX¿ŒõƉž=yû)¬uvoÙ²µ¡¡¡|«Z´\!O›‹",I̽—ŸXc꫃ßî¾’y"kˆ¦jˆ€¥`“–ß±é».‡×hÚ²,Ÿ>‹Åxž¯­­­¯¯w8fI}AËë—ºu™Á¥‚YÆ6Fzbü©7ÏÿŸl)JK,/Þ¸  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1 个答案:

答案 0 :(得分：1)

您必须将Content-Type标题发送到浏览器才能将其呈现为图像。在输出任何内容之前尝试添加以下内容：

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您还可以在imagepng documentation的示例代码中查看它的用法，以便更好地参考。

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