获取http响应的头信息

get_headers_by_curl.php

<?php
/*
获取http响应的头信息

parameter:
	$url : the target url
	$formate: if non-zero,function parses the response and sets the array's keys
return :
 array
 return example:
 Array
 (
     [url] => http://www.csdn.net/article/2013-03-11/2814436-Google-10-rules-for-designing-data-centers
     [content_type] => text/html; charset=utf-8
     [http_code] => 200
     [header_size] => 165
     [request_size] => 228
     [filetime] => -1
     [ssl_verify_result] => 0
     [redirect_count] => 0
     [total_time] => 0.218763
     [namelookup_time] => 0.098122
     [connect_time] => 0.106448
     [pretransfer_time] => 0.106491
     [size_upload] => 0
     [size_download] => 0
     [speed_download] => 0
     [speed_upload] => 0
     [download_content_length] => -1
     [upload_content_length] => 0
     [starttransfer_time] => 0.218702
     [redirect_time] => 0
 ) 
*/
if ( ! function_exists('get_headers_by_curl'))
{
    function get_headers_by_curl($url) 
	{ 
	    $ch = curl_init();		 
	    curl_setopt($ch, CURLOPT_URL,            $url); 
			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER,false);		
	    curl_setopt($ch, CURLOPT_HEADER,         true);  //包含 HTTP 头
	    curl_setopt($ch, CURLOPT_NOBODY,         true);  //不读取页面内容
	    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
			curl_setopt($ch, CURLOPT_FOLLOWLOCATION,true);
	    curl_setopt($ch, CURLOPT_TIMEOUT,        15); 
			curl_setopt($ch, CURLOPT_USERAGENT, USER_AGENT);
			curl_setopt($ch, CURLOPT_VERBOSE, false);				
	    $r = curl_exec($ch);

			if(!$r) 
			{
					$headers = FALSE;
			}else
			{
					$headers = curl_getinfo($ch);
			}		
	
			curl_close($ch);
		
	    return $headers; 
	} 
		
}