PHP下载远程文件到本地存储的方法

<?php function GrabImage($url,$filename="") { if($url=="") return false; if($filename=="") { $ext=strrchr($url,"."); if($ext!=".gif" && $ext!=".jpg") return false; $filename=date("dMYHis").$ext; } ob_start(); readfile($url); $img = ob_get_contents(); ob_end_clean(); $size = strlen($img); $fp2=@fopen($filename, "a"); fwrite($fp2,$img); fclose($fp2); return $filename; } function gethttpimage($url){ if(!empty($url)){ $filename=uniqid().strrchr($url,"."); echo $filename; $get_file=@file_get_contents($url); if($get_file){ $fp=@fopen($filename,"w"); @fwrite($fp,$get_file); @fclose($fp); } return $imgUrl; }else{ return false; } } //$img=GrabImage("https://www.jb51.net/images/logo.gif",""); $img=gethttpimage("https://www.jb51.net/images/logo.gif",""); if($img) echo '<pre><img src="'https://www.jb51.net/article/.$img.'"></pre>'; else echo "false"; ?>