php中可以通过curl来模拟http请求，同时可以获取http response header和body，当然也设置参数可以只获取其中的某一个。当设置同时获取response header和body时候，它们会一同作为结果返回。这时需要我们自己来分离它们。

下面代码是模拟向google一个http GET请求

function httpGet() {
       $url = 'http://www.google.com.hk'; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_HEADER, TRUE); //表示需要response header curl_setopt($ch, CURLOPT_NOBODY, FALSE); //表示需要response body curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, FALSE); curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE); curl_setopt($ch, CURLOPT_TIMEOUT, 120); $result = curl_exec($ch); if (curl_getinfo($ch, CURLINFO_HTTP_CODE) == '200') { return $result; } return NULL; }

调用上述方法后看到如下类似输出：

HTTP/1.1 200 OK Date: Tue, 09 Jul 2013 14:21:08 GMT Expires: -1 Cache-Control: private, max-age=0 Content-Type: text/html; charset=UTF-8 Set-Cookie: PREF=ID=75e996a7ad21f47b:FF=0:NW=1:TM=1373379668:LM=1373379668:S=TTLQQN-jwGDYnkkY; expires=Thu, 09-Jul-2015 14:21:08 GMT; path=/; domain=.google.com.hk Set-Cookie: NID=67=PPu7FfFeuZqwfsrUifgzjidX4JZxxCPLe9xFHjdXhfHpzs3gaykFSH5uGXy2esWTlp_rdqIYkjFDMollzI_sA-8owxD3mDh6KCRwdMa9-g5VChj0E5XAGNjo9d-sZfLN; expires=Wed, 08-Jan-2014 14:21:08 GMT; path=/; domain=.google.com.hk; HttpOnly P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info." Server: gws X-XSS-Protection: 1; mode=block X-Frame-Options: SAMEORIGIN Transfer-Encoding: chunked Google(function(){ window.google={ kEI:"VBzcUdWuHOmtiQf64IHoCw",getEI:function(a){ for(var b;a&&(!a.getAttribute||!(b=a.getAttribute("eid"))); ……

这里可以看到结果中header和body信息是在一起的，那么如何分离它们呢。方法有二种，一是通过curl自带的curl_getinfo()方法获取头的长度，然后使用substr来分割字符串。示例代码如下：

$response = curl_exec($ch); if (curl_getinfo($ch, CURLINFO_HTTP_CODE) == '200') { $headerSize = curl_getinfo($ch, CURLINFO_HEADER_SIZE); $header = substr($response, 0, $headerSize); $body = substr($response, $headerSize); }

第二种方法基于header和body是通过两个回车换行来分割的，所以可以通过如下代码实现：

$response = curl_exec($ch); if (curl_getinfo($ch, CURLINFO_HTTP_CODE) == '200') { list($header, $body) = explode("\r\n\r\n", response, 2); }