php下载远程的图片

function downWXimg($path_2,$uid){  
$curl = curl_init($path_2);
$filename ="WX_".time()."_".rand(1000,9999).".jpg";
curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
$imageData = curl_exec($curl);
curl_close($curl);
$tp = @fopen("../testimg/".$filename,'aw');
fwrite($tp, $imageData);
fclose($tp);
$path="http://xxxx/testimg/".$filename;
 
}