PHP获取图片体积的函数，基本准确

最新推荐文章于 2021-04-07 07:18:40 发布

转载最新推荐文章于 2021-04-07 07:18:40 发布 · 288 阅读

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原文链接：http://www.cnblogs.com/keringing/archive/2013/06/13/3134130.html

文章标签：

#php

本文介绍了一种使用PHP的cURL方法来获取远程文件的实际大小，包括如何设置cURL选项来发送HTTP HEAD请求并解析头部信息以提取Content-Length字段。

      function remote_filesize($uri,$user='',$pw=''){ 
      // start output buffering 
	  ob_start();
	   // initialize curl with given uri 
	   $ch = curl_init($uri); // make sure we get the header
	    curl_setopt($ch, CURLOPT_HEADER, 1); // make it a http HEAD request 
		curl_setopt($ch, CURLOPT_NOBODY, 1); // if auth is needed, do it here 
		if (!empty($user) && !empty($pw)) {
			 $headers = array('Authorization: Basic ' . base64_encode($user.':'.$pw)); 
			  curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); }
			   $okay = curl_exec($ch); 
			  curl_close($ch); // get the output buffer 
			  $head = ob_get_contents(); // clean the output buffer and return to previous // buffer settings 
			  ob_end_clean();  // gets you the numeric value from the Content-Length // field in the http header
			   $regex = '/Content-Length:\s([0-9].+?)\s/'; 
			   $count = preg_match($regex, $head, $matches);  // if there was a Content-Length field, its value // will now be in $matches[1] 
			   if (isset($matches[1])) 
			   { $size = $matches[1]; }
			    else { $size = 'unknown'; } 
				$last=round($size/(1024*1024),3); 
				return $last.' MB';
				}
				//用法 echo remote_filesize($url,$user='',$pw='');

转载于:https://www.cnblogs.com/keringing/archive/2013/06/13/3134130.html