PHP--获取响应头(Response Header)方法

Dear 丶 2022-05-30 09:55 517阅读 0赞

原文地址：[点击打开链接][Link 1]

方法一:

$baiduUrl = "http://www.baidu.com/link?url=LZE_J6a1AcieLlTzNxUZQVpe2trQ99zx1ls85ux8dXaGlFB3eiEm_Y6SJC1sNQf_";
    
    file_get_contents($baiduUrl);
    $responseInfo = $http_response_header;
    
    print_r($responseInfo);
    // 输出:
    Array
    (
        [0] => HTTP/1.1 302 Found
        [1] => Date: Fri, 27 Jun 2014 02:47:35 GMT
        [2] => Server: Apache
        [3] => Location: http://www.edeng.cn/s/chuna/
        [4] => Cache-Control: max-age=86400
        [5] => Expires: Sat, 28 Jun 2014 02:47:35 GMT
        [6] => Content-Length: 212
        [7] => Connection: Close
        [8] => Content-Type: text/html; charset=iso-8859-1
        [9] => HTTP/1.1 200 OK
        [10] => Server: nginx/1.4.3
        [11] => Date: Fri, 27 Jun 2014 02:47:35 GMT
        [12] => Content-Type: text/html; charset=utf-8
        [13] => Connection: close
        [14] => Expires: Mon, 26 Jul 1997 05:00:00 GMT
        [15] => Last-Modified: Fri, 27 Jun 2014 02:47:35 GMT
        [16] => Cache-Control: no-store, no-cache, must-revalidate
        [17] => Pragma: no-cache
        [18] => Vary: User-Agent,Accept-Encoding
        [19] => X-Cache: MISS from web1.edeng.cn
        [20] => Via: 1.1 web1.edeng.cn:80 (squid)
    )

遍历该数组即可得到相应的值。比如要想获得 Location 的值:

foreach ($responseInfo as $loop) {
    if(strpos($loop, "Location") !== false){
    $edengUrl = trim(substr($loop, 10));
    print_r($edengUrl);
    // 输出: http://www.edeng.cn/s/chuna/
    }
    }

方法二:

function get_head($sUrl){
    $oCurl = curl_init();
    // 设置请求头, 有时候需要,有时候不用,看请求网址是否有对应的要求
    $header[] = "Content-type: application/x-www-form-urlencoded";
    $user_agent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36";
    
    curl_setopt($oCurl, CURLOPT_URL, $sUrl);
    curl_setopt($oCurl, CURLOPT_HTTPHEADER,$header);
    // 返回 response_header, 该选项非常重要,如果不为 true, 只会获得响应的正文
    curl_setopt($oCurl, CURLOPT_HEADER, true);
    // 是否不需要响应的正文,为了节省带宽及时间,在只需要响应头的情况下可以不要正文
    curl_setopt($oCurl, CURLOPT_NOBODY, true);
    // 使用上面定义的 ua
    curl_setopt($oCurl, CURLOPT_USERAGENT,$user_agent);
    curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1 );
    // 不用 POST 方式请求, 意思就是通过 GET 请求
    curl_setopt($oCurl, CURLOPT_POST, false);
    
    $sContent = curl_exec($oCurl);
    // 获得响应结果里的：头大小
    $headerSize = curl_getinfo($oCurl, CURLINFO_HEADER_SIZE);
    // 根据头大小去获取头信息内容
    $header = substr($sContent, 0, $headerSize);
        
    curl_close($oCurl);
    
    return $header;
    }

如上面解析,我们可以成功获得到头信息:

HTTP/1.1 302 Found
    Date: Fri, 27 Jun 2014 02:47:35 GMT
    Server: Apache
    Location: http://www.edeng.cn/s/chuna/
    Cache-Control: max-age=86400
    Expires: Sat, 28 Jun 2014 02:47:35 GMT
    Connection: Keep-Alive
    Content-Type: text/html; charset=iso-8859-1

这时候，如果我们想获得 Location  项的内容，可以先把上面头正文件按回车换行切割成数组，然后再遍历匹配，如：

$responseHead = post_head($baiduUrl);
    
    $headArr = explode("\r\n", $responseHead);
    foreach ($headArr as $loop) {
    if(strpos($loop, "Location") !== false){
    $edengUrl = trim(substr($loop, 10));
    print_r($edengUrl);
    // 输出: http://www.edeng.cn/s/chuna/
    }
    }

[Link 1]: http://blog.sina.com.cn/s/blog_5f54f0be0102uvxu.html