本文实例讲述了PHP设置头信息及取得返回头信息的方法。分享给大家供大家参考，具体如下：
设置请求的头信息，我们可以用header函数，可以用fsockopen,可以用curl等，本文主要讲的是用curl来设置头信息，并取得返回后的头信息。
一、请求方设置自己的头信息，header.php
<?php
function FormatHeader($url, $myIp = null,$xml = null)
{
// 解悉url
$temp = parse_url($url);
$query = isset($temp['query']) ? $temp['query'] : '';
$path = isset($temp['path']) ? $temp['path'] : '/';
$header = array (
"POST {$path}?{$query} HTTP/1.1",
"Host: {$temp['host']}",
"Content-Type: text/xml; charset=utf-8",
'Accept: */*',
"Referer: http://{$temp['host']}/",
'User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1)',
"X-Forwarded-For: {$myIp}",
"Content-length: 380",
"Connection: Close"
);
return $header;
}
$interface = 'http://localhost/test/header2.php';
$header = FormatHeader($interface,'10.1.11.1');
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $interface);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header); //设置头信息的地方
curl_setopt($ch, CURLOPT_HEADER, 0); //不取得返回头信息
curl_setopt($ch, CURLOPT_TIMEOUT, 5);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
var_dump($result);
?>
二、被请求方，取得头信息，header2.php
<?php print_r($_SERVER); //头信息里面有内容绝大部分是放在系统变量里面的 ?>
三、看一下header.php请求的结果
string(1045) "Array ( [HTTP_HOST] => localhost [CONTENT_TYPE] => text/xml; charset=utf-8 [HTTP_ACCEPT] => */* [HTTP_REFERER] => http://localhost/ [HTTP_USER_AGENT] => Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1) [HTTP_X_FORWARDED_FOR] => 10.1.11.1 [CONTENT_LENGTH] => 380 [PATH] => /usr/local/bin:/usr/bin:/bin [SERVER_SIGNATURE] => <address>Apache/2.2.16 (Ubuntu) Server at localhost Port 80</address> 。。。。。。。。。。。。。。。。。。。。。。。。。。。。 )
上面那几个，我们可以明显看到，是我设置的头信息。
四、取得返回的头信息
curl_setopt($ch, CURLOPT_HEADER, 1); //取得返回头信息
我们把CURLOPT_HEADER设置成1，在取得的结果当中，显示数组的前面会有这些信息
string(1239) "HTTP/1.1 200 OK Date: Fri, 27 May 2011 01:57:57 GMT Server: Apache/2.2.16 (Ubuntu) X-Powered-By: PHP/5.3.3-1ubuntu9.5 Vary: Accept-Encoding Content-Length: 1045 Content-Type: text/html Array ( [HTTP_HOST] => localhost [CONTENT_TYPE] => text/xml; charset=utf-8 [HTTP_ACCEPT] => */*
五、$_SERVER部分头信息是拿不到的
修改一下header.php
<?php
function FormatHeader($url, $myIp = null,$xml = null)
{
// 解悉url
$temp = parse_url($url);
$query = isset($temp['query']) ? $temp['query'] : '';
$path = isset($temp['path']) ? $temp['path'] : '/';
$header = array (
"POST {$path}?{$query} HTTP/1.1",
"Host: {$temp['host']}",
"Content-Type: text/xml; charset=utf-8",
'Accept: */*',
"Referer: http://{$temp['host']}/",
'User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; SV1)',
"X-Forwarded-For: {$myIp}",
"Content-length: " . strlen($xml) ."rnrn" .$xml, //修改1
"Connection: Close"
);
return $header;
}
$xml = '<?xml version="1.0" encoding="utf-8"?> //修改2
<profile>
<sha1>adsfadsf</sha1>
<user_id>asdfasdf</user_id>
<album_id>asdf</album_id>
<album_name>asdf</album_name>
<tags>asdfasd</tags>
<title>asdfasdf</title>
<content>asdfadsf</content>
<type>asdfasdf</type>
<copyright>asdfasdf</copyright>
</profile>';
$interface = 'http://localhost/test/header2.php';
$header = FormatHeader($interface,'10.1.11.1',$xml); //修改3
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $interface);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header); //设置头信息的地方
curl_setopt($ch, CURLOPT_HEADER, 0); //不取得返回头信息
curl_setopt($ch, CURLOPT_TIMEOUT, 5);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
var_dump($result);
?>
如果这样的话，header2.php里面，打印$_SERVER不可能把头信息中的xml打印出来。这个时候，我们在header2.php后面加上以下二行
$raw_post_data = file_get_contents('php://input', 'r');
var_dump($raw_post_data);
这样就可以取到$xml的内容，并且只会取$xml的内容。
希望本文所述对大家PHP程序设计有所帮助。