apache_request_headers

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

apache_request_headers — 获取全部 HTTP 请求头信息

说明

array apache_request_headers ( void )

获取当前请求的所有请求头信息

返回值

包含当前请求所有头信息的数组，失败返回 FALSE 。

更新日志

版本 说明
5.5.7 此函数可用于 CLI server。
5.4.0 此函数可用于 FastCGI。 此前仅在PHP以 Apache 模块方式运行时支持。
4.3.3

从 PHP 4.3.3 起，也可在 Netscape/iPlanet/SunONE Web 服务器的 NSAPI 服务器模块使用此函数。

范例

Example #1 apache_request_headers() 示例

<?php
$headers = apache_request_headers();

foreach ($headers as $header => $value) {
    echo "$header: $value <br />\n";
}
?>

以上例程的输出类似于：

Accept: */*
Accept-Language: en-us
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0
Host: www.example.com
Connection: Keep-Alive

注释

Note:

你也可以试图从环境变量中读取普通CGI变量，PHP以Apache模块方式运行时有可能无法获得。使用phpinfo()获得可读取的变量列表。 环境变量.

参见

User Contributed Notes

egocentryk 04-Feb-2015 08:13
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; }
 ?>
uli dot staerk at globalways dot net 16-Dec-2014 06:22
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 );
        }
}
callum85 at notspam dot msn dot com 19-Apr-2007 08:07
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.
limalopex.eisfux.de 29-Oct-2006 06:01
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 );
}
///
}
///
?>