<?php
    function GetImage($url, $filename = "") {
        if ($url == "") {
            return false;
        }
 
        if ($filename == "") {
            $ext = strrchr ( $url, "." );
            if ($ext != ".gif" && $ext != ".jpg" && $ext != ".png") {
                return false;
            }
            $filename = time () . $ext;
        }
 
        //文件 保存路径
        ob_start ();
        readfile ( $url );
        $img = ob_get_contents ();
        ob_end_clean ();
        $size = strlen ( $img );
 
        //文件大小
        $fp2 = @fopen ( $filename, "a" );
        fwrite ( $fp2, $img );
        fclose ( $fp2 );
        return $filename;
    }
 
    GetImage ( "http://XXXXX" );
?>