1 
      $width){ 25             //裁剪 26             // 改变后的图象的比例 27             $resize_ratio = ($width) / ($height);  28             // 实际图象的比例 29             $ratio = ($src_width) / ($src_height); 30              31             if ($ratio >= $resize_ratio) { 32                 // 高度优先 33                 //截取图片中间那一段 34                 $img_center_x = intval(($src_width-($src_height * $resize_ratio))/2); 35                 //如果不需要只截取中间那一段，而是从图片x＝0的地方截取，则$img_center_x=0 36                 $newimg = @imagecreatetruecolor($width, $height); 37                 $color = imagecolorallocate($newimg,255,255,255);  38                 imagecolortransparent($newimg,$color);  39                 imagefill($newimg,0,0,$color);  40                 @imagecopyresampled($newimg, $src_img, 0, 0, $img_center_x, 0, $width, $height, (($src_height) * $resize_ratio), $src_height); 41                 // ImageJpeg($newimg); 42             }else{ 43                 // 宽度优先 44                 //截取图片中间那一段 45                 $img_center_y = intval(($src_height-($src_width / $resize_ratio))/2); 46                 //如果不需要只截取中间那一段，而是从图片y＝0的地方截取，则$img_center_y=0 47                 $newimg = @imagecreatetruecolor($width, $height); 48                 $color = imagecolorallocate($newimg,255,255,255);  49                 imagecolortransparent($newimg,$color);  50                 imagefill($newimg,0,0,$color);  51                 @imagecopyresampled($newimg, $src_img, 0, 0, 0, $img_center_y, $width, $height, $src_width, (($src_width) / $resize_ratio)); 52             } 53         }else{ 54             //不裁剪 55             $newimg = @imagecreatetruecolor($src_width, $src_height); 56             $color = imagecolorallocate($newimg,255,255,255);  57             imagecolortransparent($newimg,$color);  58             imagefill($newimg,0,0,$color);  59             @imagecopyresampled($newimg, $src_img, 0, 0, 0, 0, $src_width, $src_height, $src_width, $src_height); 60         } 61          62         //统一保存为png格式 63         imagepng($newimg, $dest_path); 64          65         //gc 66         imagedestroy($src_img); 67         imagedestroy($newimg); 68     } 69      70     public static function thumb_img($src_path, $dest_path,$width,$height){ 71  72         $info_arr = getimagesize($src_path); 73         $src_width = $info_arr[0]; 74         $src_height = $info_arr[1]; 75          76         switch( $info_arr['mime'] ) { 77             case 'image/gif': 78                 $src_img = imagecreatefromgif( $src_path ); 79                 break; 80             case 'image/jpeg': 81                 $src_img = imagecreatefromjpeg( $src_path ); 82                 break; 83             case 'image/png': 84                 $src_img = imagecreatefrompng( $src_path );  85                 break; 86         } 87          88          // 改变后的图象的比例 89         $resize_ratio = ($width) / ($height);  90         // 实际图象的比例 91         $ratio = ($src_width) / ($src_height); 92          93         if ($ratio >= $resize_ratio) { 94             // 高度优先 95             //截取图片中间那一段 96             $img_center_x = intval(($src_width-($src_height * $resize_ratio))/2); 97             //如果不需要只截取中间那一段，而是从图片x＝0的地方截取，则$img_center_x=0 98             $newimg = @imagecreatetruecolor($width, $height); 99             $color = imagecolorallocate($newimg,255,255,255); 100             imagecolortransparent($newimg,$color); 101             imagefill($newimg,0,0,$color); 102             @imagecopyresampled($newimg, $src_img, 0, 0, $img_center_x, 0, $width, $height, (($src_height) * $resize_ratio), $src_height);103             // ImageJpeg($newimg);104         }else{105             // 宽度优先106             //截取图片中间那一段107             $img_center_y = intval(($src_height-($src_width / $resize_ratio))/2);108             //如果不需要只截取中间那一段，而是从图片y＝0的地方截取，则$img_center_y=0109             $newimg = @imagecreatetruecolor($width, $height);110             $color = imagecolorallocate($newimg,255,255,255); 111             imagecolortransparent($newimg,$color); 112             imagefill($newimg,0,0,$color); 113             @imagecopyresampled($newimg, $src_img, 0, 0, 0, $img_center_y, $width, $height, $src_width, (($src_width) / $resize_ratio));114         }115         116         //统一保存为png格式117         imagepng($newimg, $dest_path);118         119         //gc120         imagedestroy($src_img);121         imagedestroy($newimg);122     }123     124     /*125     * 按比例缩放图片，然后居中裁剪126     * $src_path 源文件路劲127     * $dest_path 裁剪图片存放位置128     * $width 裁剪图片宽带129     * $height 裁剪图片高度130     */131     public static function clip_img($src_path, $dest_path, $width, $height) {132         if( file_exists($src_path) ) {133             $info_arr = getimagesize($src_path);134             $src_width = $info_arr[0];135             $src_height = $info_arr[1];136             $src_ratio = $src_height / $src_width;137             $dest_ratio = $height / $width;138             139             if( $src_ratio < $dest_ratio ) {140                 $ratio_width = $width;141                 $ratio_height = ( $height * $src_height ) / $src_width;142             }else if( $src_ratio > $dest_ratio ) {143                 $ratio_height = $height;144                 $ratio_width = ( $width * $src_width ) / $src_height;145             }else {146                 $ratio_height = $height;147                 $ratio_width = $width;148             }149             150             switch( $info_arr['mime'] ) {151                 case 'image/gif':152                     $src_img = imagecreatefromgif( $src_path );153                     break;154                 case 'image/jpeg':155                     $src_img = imagecreatefromjpeg( $src_path );156                     break;157                 case 'image/png':158                     $src_img = imagecreatefrompng( $src_path );159                     break;160                 case 'image/bmp':161                     //待处理162                     break;163             }164             165             //等比例缩放图片166             $thumb_img = imagecreatetruecolor( intval($ratio_width), intval($ratio_height) ) ;167             $color = imagecolorallocate($thumb_img,255,255,255); 168             imagecolortransparent($thumb_img,$color); 169             imagefill($thumb_img,0,0,$color); 170             imagecopyresampled( $thumb_img, $src_img, 0, 0, 0, 0, $ratio_width, $ratio_height, $src_width, $src_height);171             172             //剪裁173             $clip_img = imagecreatetruecolor( intval($width), intval($height) );174             imagecopy( $clip_img, $thumb_img, 0, 0, ( $ratio_width - $width ) / 2, ( $ratio_height - $height ) / 2, $width, $height );175             176             //统一保存为png格式177             imagepng($clip_img, $dest_path);178             179             //gc180             imagedestroy($src_img);181             imagedestroy($thumb_img);182             imagedestroy($clip_img);183         }    184     }185     186     /*187     * 按比例缩放图片188     * type = 1 按宽为标准缩放 2 按高为标准缩放 189     */190     public static function scale_img($src_path,$dest_path,$type,$len){191         if( file_exists($src_path) ){192             $info_arr = getimagesize($src_path);193             $src_width = $info_arr[0];194             $src_height = $info_arr[1];195             if($type == 1){196                 $des_width = $len;197                 $des_height = ( $src_height * $des_width ) / $src_width;198             }else{199                 $des_height = $len;200                 $des_width = ( $src_width * $des_height ) / $src_height;201             }202             203             switch( $info_arr['mime'] ) {204                 case 'image/gif':205                     $src_img = imagecreatefromgif( $src_path );206                     break;207                 case 'image/jpeg':208                     $src_img = imagecreatefromjpeg( $src_path );209                     break;210                 case 'image/png':211                     $src_img = imagecreatefrompng( $src_path );212                     break;213                 case 'image/bmp':214                     //待处理215                     break;216             }217             218             $thumb_img = imagecreatetruecolor( intval($des_width), intval($des_height) );219             $color = imagecolorallocate($thumb_img,255,255,255); 220             imagecolortransparent($thumb_img,$color); 221             imagefill($thumb_img,0,0,$color); 222             imagecopyresampled( $thumb_img, $src_img, 0, 0, 0, 0, $des_width, $des_height, $src_width, $src_height);223         224             225             //统一保存为png格式226             imagepng($thumb_img, $dest_path);227             228             //gc229             imagedestroy($src_img);230             imagedestroy($thumb_img);231         }232     }233 234 }