Although we expect to see headers in mixed case, the standard RFC2616 demands that "field names are case-insensitive". PHP delivers the headers exactly untouched in whatever way the client sent them. Potentially you should expect to get any type of uppercase or lowercase or mixed.
Thus, if you want to be standards compliant, you must loop through every key and check it in a case-insensitive manner, instead of doing the obvious thing and using the name of the header as an array index.
apache_request_headers
(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
apache_request_headers — Liefert alle HTTP-Requestheader
Beschreibung
apache_request_headers
(
) : array
Liefert alle HTTP-Requestheader von der aktuellen Anfrage. Verfügbar unter Apache-, FastCGI-, CLI- und FPM-Webservern.
Rückgabewerte
Ein assoziatives Array aller HTTP-Header der aktuellen Anfrage, im Fehlerfall
wird false zurückgegeben.
Changelog
| Version | Beschreibung |
|---|---|
| 7.3.0 | Diese Funktion wurde in der FPM SAPI verfügbar. |
Beispiele
Beispiel #1 apache_request_headers()-Beispiel
<?php
$headers = apache_request_headers();
foreach ($headers as $header => $value) {
echo "$header: $value <br />\n";
}
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
Accept: */* Accept-Language: en-us Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 Host: www.example.com Connection: Keep-Alive
Anmerkungen
Hinweis:
Die Werte der gebräuchlichsten CGI-Variablen können Sie auch durch das Auslesen der Umgebungsvariablen erhalten. Dieser Weg funktioniert unabhängig davon, ob Sie PHP als Modul für Apache benutzen. Verwenden Sie phpinfo(), um eine Liste aller zur Verfügung stehenden Umgebungsvariablen zu erhalten.
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User Contributed Notes 5 notes
Tel ¶
4 years ago
limalopex.eisfux.de ¶
17 years ago
I didn't found a replacement for apache_request_headers() in PHP::Compat (http://pear.php.net/package/PHP_Compat) so I wrote my own:
<?php
if( !function_exists('apache_request_headers') ) {
///
function apache_request_headers() {
$arh = array();
$rx_http = '/\AHTTP_/';
foreach($_SERVER as $key => $val) {
if( preg_match($rx_http, $key) ) {
$arh_key = preg_replace($rx_http, '', $key);
$rx_matches = array();
// do some nasty string manipulations to restore the original letter case
// this should work in most cases
$rx_matches = explode('_', $arh_key);
if( count($rx_matches) > 0 and strlen($arh_key) > 2 ) {
foreach($rx_matches as $ak_key => $ak_val) $rx_matches[$ak_key] = ucfirst($ak_val);
$arh_key = implode('-', $rx_matches);
}
$arh[$arh_key] = $val;
}
}
return( $arh );
}
///
}
///
?>
egocentryk ¶
9 years ago
Superglobal $_SERVER, used in all patches for missing getallheaders() contains only truly basic headers. To pass ANY header into PHP in any httpd environment, including CGI/FCGI just add rule (any number of rules) into .htaccess:
RewriteRule .* - [E=HTTP_MY_HEADER:%{HTTP:My-Header}]
and the header with it's value will appear for PHP as
<?php print $_SERVER['HTTP_MY_HEADER']; ?>
And... just couldn't hold off. Rewrtiting $_SERVER keys for replacing missing function really does not require RegExps, preg_matches or evals... Try this:
<?php
function getallheaders() {
foreach($_SERVER as $K=>$V){$a=explode('_' ,$K);
if(array_shift($a)=='HTTP'){
array_walk($a,function(&$v){$v=ucfirst(strtolower($v));});
$retval[join('-',$a)]=$V;}
} return $retval; }
?>
callum85 at notspam dot msn dot com ¶
17 years ago
There is a simple way to get request headers from Apache even on PHP running as a CGI. As far as I know, it's the only way to get the headers "If-Modified-Since" and "If-None-Match" when apache_request_headers() isn't available. You need mod_rewrite, which most web hosts seem to have enabled. Put this in an .htacess file in your web root:
RewriteEngine on
RewriteRule .* - [E=HTTP_IF_MODIFIED_SINCE:%{HTTP:If-Modified-Since}]
RewriteRule .* - [E=HTTP_IF_NONE_MATCH:%{HTTP:If-None-Match}]
The headers are then available in PHP as
<?php
$_SERVER['HTTP_IF_MODIFIED_SINCE'];
$_SERVER['HTTP_IF_NONE_MATCH'];
?>
I've tested this on PHP/5.1.6, on both Apache/2.2.3/Win32 and Apache/2.0.54/Unix, and it works perfectly.
Note: if you use RewriteRules already for clean URLs, you need to put the above rules AFTER your existing ones.
uli dot staerk at globalways dot net ¶
9 years ago
A slightly modified version from limalopex.eisfux.de. Fixes the missing Headers Content-Type and Content-Length and makes it Camel-Case.
<?php
if( !function_exists('apache_request_headers') ) {
function apache_request_headers() {
$arh = array();
$rx_http = '/\AHTTP_/';
foreach($_SERVER as $key => $val) {
if( preg_match($rx_http, $key) ) {
$arh_key = preg_replace($rx_http, '', $key);
$rx_matches = array();
// do some nasty string manipulations to restore the original letter case
// this should work in most cases
$rx_matches = explode('_', strtolower($arh_key));
if( count($rx_matches) > 0 and strlen($arh_key) > 2 ) {
foreach($rx_matches as $ak_key => $ak_val) $rx_matches[$ak_key] = ucfirst($ak_val);
$arh_key = implode('-', $rx_matches);
}
$arh[$arh_key] = $val;
}
}
if(isset($_SERVER['CONTENT_TYPE'])) $arh['Content-Type'] = $_SERVER['CONTENT_TYPE'];
if(isset($_SERVER['CONTENT_LENGTH'])) $arh['Content-Length'] = $_SERVER['CONTENT_LENGTH'];
return( $arh );
}
}
