php-doc-en/reference/apache/functions/getallheaders.xml

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  <refentry id="function.getallheaders">
   <refnamediv>
    <refname>getallheaders</refname>
    <refpurpose>Fetch all HTTP request headers</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>array</type><methodname>getallheaders</methodname>
      <void/>
     </methodsynopsis>
    <para>
     <function>getallheaders</function> is an alias for
     <function>apache_request_headers</function>.  It will return an
     associative array of all the HTTP headers in the current request.
     Please read the <function>apache_request_headers</function>
     documentation for more information on how this function works.
    </para>
    <note>
     <para>
      In PHP 4.3.0, <function>getallheaders</function> became an
      alias for <function>apache_request_headers</function>.
      Essentially, it was renamed.  This is because this function
      only works when PHP is compiled as an
      <productname>Apache</productname> Module.
     </para>
    </note>
    &note.apache.nsapi-module;
    <para>
     See also <function>apache_request_headers</function>.
    </para>
   </refsect1>
  </refentry>

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