<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.apache-request-headers" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>apache_request_headers</refname>
  <refpurpose>Fetch all HTTP request headers</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>apache_request_headers</methodname>
   <void/>
  </methodsynopsis>
  <para>
   Fetches all HTTP request headers from the current request. Works in the
   Apache, FastCGI, CLI, and FPM webservers.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   An associative array of all the HTTP headers in the current request, or
   &false; on failure.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>7.3.0</entry>
       <entry>
        This function became available in the FPM SAPI.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>apache_request_headers</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$headers = apache_request_headers();

foreach ($headers as $header => $value) {
    echo "$header: $value <br />\n";
}
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
Accept: */*
Accept-Language: en-us
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0
Host: www.example.com
Connection: Keep-Alive
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    You can also get at the value of the common <acronym>CGI</acronym> variables by
    reading them from the environment, which works whether or not
    you are using PHP as an <productname>Apache</productname> module. Use
    <function>phpinfo</function> to see a list of all of the available
    <link linkend="language.variables.predefined">environment variables</link>.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>apache_response_headers</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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