php压缩图片

/** 
* desription 压缩图片 
* @param sting $imgsrc 图片路径 
* @param string $imgdst 压缩后保存路径 
*/
function image_png_size_add($imgsrc,$imgdst){
    list($width,$height,$type) = getimagesize($imgsrc);  
    $new_width = "64";  
    $new_height = "64";
    switch($type){
        case 1:
            $giftype=check_gifcartoon($imgsrc);  
            if($giftype){
                header(‘Content-Type:image/gif‘);  
                $image_wp=imagecreatetruecolor($new_width, $new_height);  
                $image = imagecreatefromgif($imgsrc);  
                imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);  
                imagejpeg($image_wp, $imgdst,75);  
                imagedestroy($image_wp);  
            }  
            break;  
        case 2:
            header(‘Content-Type:image/jpeg‘);  
            $image_wp=imagecreatetruecolor($new_width, $new_height);  
            $image = imagecreatefromjpeg($imgsrc);  
            imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);  
            imagejpeg($image_wp, $imgdst,75);  
            imagedestroy($image_wp);  
            break;
        case 3:
            header(‘Content-Type:image/png‘);  
            $image_wp=imagecreatetruecolor($new_width, $new_height);  
            $image = imagecreatefrompng($imgsrc);  
            imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);  
            imagejpeg($image_wp, $imgdst,75);  
            imagedestroy($image_wp);  
            break;  

    }  

}  

/** 
* desription 判断是否gif动画 
* @param sting $image_file图片路径 
* @return boolean t 是 f 否 
*/

function check_gifcartoon($image_file){  
    $fp = fopen($image_file,‘rb‘);  
    $image_head = fread($fp,1024);  
    fclose($fp);  
    return preg_match("/".chr(0x21).chr(0xff).chr(0x0b).‘NETSCAPE2.0‘."/",$image_head)?false:true;  
}