php gets remote file size_php tips

The example in this article describes the method of obtaining the remote file size in PHP and is shared with you for your reference. The specific implementation method is as follows:

/* 
**功能:获取远程文件的大小,返回值的单位是:字节 
*/ 
function get_fileSize($url){ 
  if(!isset($url)||trim($url)==''){ 
    return ''; 
  } 
  ob_start(); 
  $ch=curl_init($url); 
  curl_setopt($ch,CURLOPT_HEADER,1); 
  curl_setopt($ch,CURLOPT_NOBODY,1); 
  $okay=curl_exec($ch); 
  curl_close($ch); 
  $head=ob_get_contents(); 
  ob_end_clean(); 
  $regex='/Content-Length:\s([0-9].+?)\s/'; 
  $count=preg_match($regex,$head,$matches); 
  return isset($matches[1])&&is_numeric($matches[1])?$matches[1]:''; 
} 

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