php教程

php手册

$http_response_header

$http_response_header — HTTP 响应头

说明

$http_response_header 数组与 get_headers() 函数类似。当使用HTTP 包装器时，$http_response_header 将会被 HTTP 响应头信息填充。$http_response_header 将被创建于局部作用域中。

范例

Example #1 $http_response_header 范例


<?php
function get_contents() {
  file_get_contents("http://example.com");
  var_dump($http_response_header);
}
get_contents();
var_dump($http_response_header);
?>

以上例程的输出类似于：

array(9) {
  [0]=>
  string(15) "HTTP/1.1 200 OK"
  [1]=>
  string(35) "Date: Sat, 12 Apr 2008 17:30:38 GMT"
  [2]=>
  string(29) "Server: Apache/2.2.3 (CentOS)"
  [3]=>
  string(44) "Last-Modified: Tue, 15 Nov 2005 13:24:10 GMT"
  [4]=>
  string(27) "ETag: "280100-1b6-80bfd280""
  [5]=>
  string(20) "Accept-Ranges: bytes"
  [6]=>
  string(19) "Content-Length: 438"
  [7]=>
  string(17) "Connection: close"
  [8]=>
  string(38) "Content-Type: text/html; CHARSET=gb2312"
}
NULL

User Contributed Notes

jaraco at jaraco dot com 06-Feb-2018 11:20


If an HTTP Redirect is encountered, the headers will contain the response line and headers for all requests encountered. Consider this example:



<?php

file_get_contents("https://httpbin.org/redirect-to?url=https%3A%2F%2Fhttpbin.org%2F");

var_dump($http_response_header);

?>



Produces the following:



array(23) {

  [0]=>

  string(18) "HTTP/1.1 302 FOUND"

  [1]=>

  string(17) "Connection: close"

  [2]=>

  string(22) "Server: meinheld/0.6.1"

  [3]=>

  string(35) "Date: Tue, 06 Feb 2018 11:21:21 GMT"

  [4]=>

  string(38) "Content-Type: text/html; CHARSET=gb2312"

  [5]=>

  string(17) "Content-Length: 0"

  [6]=>

  string(30) "Location: https://httpbin.org/"

  [7]=>

  string(30) "Access-Control-Allow-Origin: *"

  [8]=>

  string(38) "Access-Control-Allow-Credentials: true"

  [9]=>

  string(19) "X-Powered-By: Flask"

  [10]=>

  string(34) "X-Processed-Time: 0.00107908248901"

  [11]=>

  string(14) "Via: 1.1 vegur"

  [12]=>

  string(15) "HTTP/1.1 200 OK"

  [13]=>

  string(17) "Connection: close"

  [14]=>

  string(22) "Server: meinheld/0.6.1"

  [15]=>

  string(35) "Date: Tue, 06 Feb 2018 11:21:21 GMT"

  [16]=>

  string(38) "Content-Type: text/html; CHARSET=gb2312"

  [17]=>

  string(21) "Content-Length: 13011"

  [18]=>

  string(30) "Access-Control-Allow-Origin: *"

  [19]=>

  string(38) "Access-Control-Allow-Credentials: true"

  [20]=>

  string(19) "X-Powered-By: Flask"

  [21]=>

  string(34) "X-Processed-Time: 0.00848388671875"

  [22]=>

  string(14) "Via: 1.1 vegur"

}

doekia at gmail dot com 20-Jun-2017 10:54


Bear in mind this special variable is somehow protected and not populated in some situation when the peer server close the connection early on (ssl reset)

=> Undefined variable: http_response_header



A code like this one:

$response = @file_get_contents($url);

empty($http_response_header) && $http_response_header = array('HTTP/1.1 400 Bad request');



Will return a cryptic error message:

Fatal error: Call to undefined function  array() on line 2



--

Should you want to cope with this situation:

$hdrs = array('HTTP/1.1 400 Bad request');

!empty($htp_response_header) && $hdrs = $http_response_headers;



Now use $hdrs in place of $http_response_header

MangaII 01-May-2015 01:01


parser function to get formatted headers (with response code)



<?php



function parseHeaders( $headers )

{

    $head = array();

    foreach( $headers as $k=>$v )

    {

        $t = explode( ':', $v, 2 );

        if( isset( $t[1] ) )

            $head[ trim($t[0]) ] = trim( $t[1] );

        else

        {

            $head[] = $v;

            if( preg_match( "#HTTP/[0-9\.]+\s+([0-9]+)#",$v, $out ) )

                $head['reponse_code'] = intval($out[1]);

        }

    }

    return $head;

}



print_r(parseHeaders($http_response_header));



/*

Array

(

    [0] => HTTP/1.1 200 OK

    [reponse_code] => 200

    [Date] => Fri, 01 May 2015 12:56:09 GMT

    [Server] => Apache

    [X-Powered-By] => PHP/5.3.3-7+squeeze18

    [Set-Cookie] => PHPSESSID=ng25jekmlipl1smfscq7copdl3; path=/

    [Expires] => Thu, 19 Nov 1981 08:52:00 GMT

    [Cache-Control] => no-store, no-cache, must-revalidate, post-check=0, pre-check=0

    [Pragma] => no-cache

    [Vary] => Accept-Encoding

    [Content-Length] => 872

    [Connection] => close

    [Content-Type] => text/html

)

*/



?>

nicolas at toniazzi dot net 01-Oct-2013 01:42


Note that the HTTP wrapper has a hard limit of 1024 characters for the header lines.

Any HTTP header received that is longer than this will be ignored and won't appear in $http_response_header.



The cURL extension doesn't have this limit.



http_fopen_wrapper.c: #define HTTP_HEADER_BLOCK_SIZE 1024

php教程 php手册 php手册

$http_response_header

说明

范例

User Contributed Notes

php教程

php手册