PHP Generate image Thumbnail function

    <?php/** * Generate thumbnail function (supports picture format: GIF, JPEG, PNG and BMP) * @author ruxing.li * @param string $src source picture  Path * @param int $width thumbnail width (equal to zoom only when height is specified) * @param int $width thumbnail height (equal to zoom only when width is specified) * @param String $filename save path (output directly to browser if not specified) * @return bool */function Mkthumbnail ($src, $width = null, $height = n          ull, $filename = null) {if (!isset ($width) &&!isset ($height)) return false;          if (Isset ($width) && $width <= 0) return false;                if (Isset ($height) && $height <= 0) return false;          $size = getimagesize ($SRC);                if (! $size) return false;          List ($src _w, $src _h, $src _type) = $size;          $SRC _mime = $size [' MIME '];                  Switch ($src _type) {Case 1: $img _type = ' gif ';              Break          Case 2: $img _type = ' jpeg ';        Break                  Case 3: $img _type = ' png ';              Break                  Case: $img _type = ' wbmp ';              Break          Default:return false;          if (!isset ($width)) $width = $src _w * ($height/$src _h);                if (!isset ($height)) $height = $src _h * ($width/$src _w); $imagecreatefunc = ' Imagecreatefrom '.          $img _type;          $src _img = $imagecreatefunc ($SRC);          $dest _img = Imagecreatetruecolor ($width, $height);                Imagecopyresampled ($dest _img, $src _img, 0, 0, 0, 0, $width, $height, $src _w, $src _h); $imagefunc = ' image '.          $img _type;          if ($filename) {$imagefunc ($dest _img, $filename);              } else {header (' Content-type: '. $src _mime);          $imagefunc ($dest _img);          } Imagedestroy ($src _img);          Imagedestroy ($dest _img); return TRUe   } $result = Mkthumbnail ('./img_3324.jpg ', 147, 147);

Support for opening GD libraries before use

PHP Generate image Thumbnail function