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$http_response_header

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

$http_response_headerEncabezados de respuesta HTTP

Descripción

El array $http_response_header es similar a la functión get_headers(). Cuando se hace uso de HTTP wrapper, $http_response_header será poblado con los encabezados de respuesta HTTP. $http_response_header será creada en el ámbito local.

Ejemplos

Ejemplo #1 Ejemplo de $http_response_header

<?php
function get_contents() {
file_get_contents("http://example.com");
var_dump($http_response_header); // variable is populated in the local scope
}
get_contents();
var_dump($http_response_header); // a call to get_contents() does not populate the variable outside the function scope
?>

El resultado del ejemplo sería algo similar a:

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=UTF-8"
}

Warning: Undefined variable $http_response_header
NULL

add a note

User Contributed Notes 6 notes

up
57
nicolas at toniazzi dot net
10 years ago
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
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37
MangaII
8 years ago
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
)
*/

?>
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2
jaraco at jaraco dot com
6 years ago
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=utf-8"
[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=utf-8"
[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"
}
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-1
carlo at tnx dot it
3 months ago
If no connection is made, $http_response_header is not reset! (tested on php 7.0/8.1)

file_get_contents("https://www.google.com/");
file_get_contents("https://www.google.fail/");
print_r($http_response_header);//Array ( [0] => HTTP/1.1 200 OK ....
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-3
doekia at gmail dot com
6 years ago
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
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-2
boz at reyboz dot it
2 years ago
It seems that, if the server returns an HTTP/1.1 100 Continue, the variable $http_response_header is unset. This corner case may be difficult to be detected.

For this and other reasons I recommend PHP cURL, instead of file_get_contents().
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