图片抓取

$url=$_GET["url"];
get_img($url);

/**
 * 获取远程图片
 * @param $url 图片URL
 */
function get_img($url){
    $ext=pathinfo($url,PATHINFO_EXTENSION);
    $ext_arr = explode("?",$ext);
    $ext=$ext_arr[0];
    if($ext=='jpg' || $ext=='gif' || $ext=='png' || $ext=='jpeg' || $ext=='bmp'){
        header('Content-type: image/'.$ext);
    }else{
        header('Content-type: image/jpg');
    }
    echo file_get_contents($url);
}