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.
apache_request_headers
(PHP 4 >= 4.3.0, PHP 5, PHP 7)
apache_request_headers — 모든 HTTP 요청 헤더를 가져옵니다
설명
array apache_request_headers
( void
)
현재 요청에서 모든 HTTP 요청 헤더를 가져옵니다.
이 함수는 PHP를 아파치 모듈로 설치하였을 때만 지원합니다.
반환값
현재 요청의 모든 HTTP 헤더에 대한 연관 배열이거나, 실패시엔 FALSE.
예제
Example #1 apache_request_headers() 예제
<?php
$headers = apache_request_headers();
foreach ($headers as $header => $value) {
echo "$header: $value <br />\n";
}
?>
위 예제의 출력 예시:
Accept: */* Accept-Language: en-us Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 Host: www.example.com Connection: Keep-Alive
주의
Note:
PHP 4.3.0 이전에, apache_request_headers()는 getallheaders()로 불리워졌습니다. PHP 4.3.0 이후의 getallheaders()는 apache_request_headers()의 단축형입니다.
Note:
환경 변수에서 일반 CGI 변수를 읽어서, PHP를 Apache 모듈로 사용하고 있는지를 확인할 수 있습니다. 모든 사용 가능한 환경 변수 목록은 phpinfo()를 이용해서 볼 수 있습니다.
PHP 4.3.3부터 이 함수를 넷스케이프/iPlanet/SunONE 웹서버의 NSAPI 서버 모듈에서도 사용할 수 있습니다.
add a note
User Contributed Notes 6 notes
callum85 at notspam dot msn dot com ¶
17 years ago
limalopex.eisfux.de ¶
18 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; }
?>
Tel ¶
5 years ago
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.
gilles at sdv dot fr ¶
2 years ago
The function apache_request_headers, doesn't exist in FCGI PHP-FPM
Use this patch : https://gist.github.com/rmpel/11583cfddfcc9705578428e3a2ee3dc1
<?php
// Drop-in replacement for apache_request_headers() when it's not available
if ( ! function_exists( 'apache_request_headers' ) ) {
function apache_request_headers() {
static $arrHttpHeaders;
if ( ! $arrHttpHeaders ) {
// Based on: http://www.iana.org/assignments/message-headers/message-headers.xml#perm-headers
$arrCasedHeaders = array(
// HTTP
'Dasl' => 'DASL',
'Dav' => 'DAV',
'Etag' => 'ETag',
'Mime-Version' => 'MIME-Version',
'Slug' => 'SLUG',
'Te' => 'TE',
'Www-Authenticate' => 'WWW-Authenticate',
// MIME
'Content-Md5' => 'Content-MD5',
'Content-Id' => 'Content-ID',
'Content-Features' => 'Content-features',
);
$arrHttpHeaders = array();
foreach ( $_SERVER as $strKey => $mixValue ) {
if ( 'HTTP_' !== substr( $strKey, 0, 5 ) ) {
continue;
}
$strHeaderKey = strtolower( substr( $strKey, 5 ) );
if ( 0 < substr_count( $strHeaderKey, '_' ) ) {
$arrHeaderKey = explode( '_', $strHeaderKey );
$arrHeaderKey = array_map( 'ucfirst', $arrHeaderKey );
$strHeaderKey = implode( '-', $arrHeaderKey );
} else {
$strHeaderKey = ucfirst( $strHeaderKey );
}
if ( array_key_exists( $strHeaderKey, $arrCasedHeaders ) ) {
$strHeaderKey = $arrCasedHeaders[ $strHeaderKey ];
}
$arrHttpHeaders[ $strHeaderKey ] = $mixValue;
}
/** in case you need authorization and your hosting provider has not fixed this for you:
* VHOST-Config:
* FastCgiExternalServer line needs -pass-header Authorization
*
* .htaccess or VHOST-config file needs:
* SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1
* to add the Authorization header to the environment for further processing
*/
if ( ! empty( $arrHttpHeaders['Authorization'] ) ) {
// in case of Authorization, but the values not propagated properly, do so :)
if ( ! isset( $_SERVER['PHP_AUTH_USER'] ) ) {
list( $_SERVER['PHP_AUTH_USER'], $_SERVER['PHP_AUTH_PW'] ) = explode( ':', base64_decode( substr( $_SERVER['HTTP_AUTHORIZATION'], 6 ) ) );
}
}
}
return $arrHttpHeaders;
}
// execute now so other scripts have little chance to taint the information in $_SERVER
// the data is cached, so multiple retrievals of the headers will not cause further impact on performance.
apache_request_headers();
}
uli dot staerk at globalways dot net ¶
10 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 );
}
}
