php保存任意网络图片到服务器的方法

<?php
function saveImage($path) {
 if(!preg_match('/\/([^\/]+\.[a-z]{3,4})$/i',$path,$matches))
 die('Use image please');
 $image_name = strToLower($matches[1]);
 $ch = curl_init ($path);
 curl_set($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_set($ch, CURLOPT_BINARYTRANSFER,1);
 $img = curl_exec ($ch);
 curl_close ($ch);
 $fp = fopen($image_name,'w');
 fwrite($fp, $img);
 fclose($fp);
}
saveImage('https://.jb51./images/logo.jpg');
?>