強大的PHP生成縮略圖函數

1. [代碼]php生成縮略圖     

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<?php   /**  * 生成縮略圖  * @author [email protected]  * @param string     源圖絕對完整地址{帶文件名及後綴名}  * @param string     目標圖絕對完整地址{帶文件名及後綴名}  * @param int        縮略圖寬{0:此時目標高度不能爲0，目標寬度爲源圖寬*(目標高度/源圖高)}  * @param int        縮略圖高{0:此時目標寬度不能爲0，目標高度爲源圖高*(目標寬度/源圖寬)}  * @param int        是否裁切{寬,高必須非0}  * @param int/float  縮放{0:不縮放, 0<this<1:縮放到相應比例(此時寬高限制和裁切均失效)}  * @return boolean  */ function img2thumb($src_img, $dst_img, $width = 75, $height = 75, $cut = 0, $proportion = 0) {     if(!is_file($src_img))     {         return false;     }     $ot = fileext($dst_img);     $otfunc = 'image' . ($ot == 'jpg' ? 'jpeg' : $ot);     $srcinfo = getimagesize($src_img);     $src_w = $srcinfo[0];     $src_h = $srcinfo[1];     $type  = strtolower(substr(image_type_to_extension($srcinfo[2]), 1));     $createfun = 'imagecreatefrom' . ($type == 'jpg' ? 'jpeg' : $type);       $dst_h = $height;     $dst_w = $width;     $x = $y = 0;       /**      * 縮略圖不超過源圖尺寸（前提是寬或高只有一個）      */     if(($width> $src_w && $height> $src_h) || ($height> $src_h && $width == 0) || ($width> $src_w && $height == 0))     {         $proportion = 1;     }     if($width> $src_w)     {         $dst_w = $width = $src_w;     }     if($height> $src_h)     {         $dst_h = $height = $src_h;     }       if(!$width && !$height && !$proportion)     {         return false;     }     if(!$proportion)     {         if($cut == 0)         {             if($dst_w && $dst_h)             {                 if($dst_w/$src_w> $dst_h/$src_h)                 {                     $dst_w = $src_w * ($dst_h / $src_h);                     $x = 0 - ($dst_w - $width) / 2;                 }                 else                 {                     $dst_h = $src_h * ($dst_w / $src_w);                     $y = 0 - ($dst_h - $height) / 2;                 }             }             else if($dst_w xor $dst_h)             {                 if($dst_w && !$dst_h)  //有寬無高                 {                     $propor = $dst_w / $src_w;                     $height = $dst_h  = $src_h * $propor;                 }                 else if(!$dst_w && $dst_h)  //有高無寬                 {                     $propor = $dst_h / $src_h;                     $width  = $dst_w = $src_w * $propor;                 }             }         }         else         {             if(!$dst_h)  //裁剪時無高             {                 $height = $dst_h = $dst_w;             }             if(!$dst_w)  //裁剪時無寬             {                 $width = $dst_w = $dst_h;             }             $propor = min(max($dst_w / $src_w, $dst_h / $src_h), 1);             $dst_w = (int)round($src_w * $propor);             $dst_h = (int)round($src_h * $propor);             $x = ($width - $dst_w) / 2;             $y = ($height - $dst_h) / 2;         }     }     else     {         $proportion = min($proportion, 1);         $height = $dst_h = $src_h * $proportion;         $width  = $dst_w = $src_w * $proportion;     }       $src = $createfun($src_img);     $dst = imagecreatetruecolor($width ? $width : $dst_w, $height ? $height : $dst_h);     $white = imagecolorallocate($dst, 255, 255, 255);     imagefill($dst, 0, 0, $white);       if(function_exists('imagecopyresampled'))     {         imagecopyresampled($dst, $src, $x, $y, 0, 0, $dst_w, $dst_h, $src_w, $src_h);     }     else     {         imagecopyresized($dst, $src, $x, $y, 0, 0, $dst_w, $dst_h, $src_w, $src_h);     }     $otfunc($dst, $dst_img);     imagedestroy($dst);     imagedestroy($src);     return true; }

2. [代碼]補充代碼     跳至 [1] [2] [3] [全屏預覽]

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function fileext($file) {     return pathinfo($file, PATHINFO_EXTENSION); }

3. [代碼]函數的使用demo（林夕9527提供）     

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$src_img = "./ROSI_050_002.JPG"; $dst_img = "./ROSI_050_002_thumb.jpg"; $stat = img2thumb($src_img, $dst_img, $width = 200, $height = 300, $cut = 0, $proportion = 0); if($stat){     echo 'Resize Image Success!<br />';     echo '<img src="'.$dst_img.'" />';    }else{     echo 'Resize Image Fail!';  }