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>
     This function returns an associative array of all the HTTP
     headers in the current request.
    </para>
    <para>
     <note>
      <para>
       You can also get at the value of the common CGI variables by
       reading them from the environment, which works whether or not
       you are using PHP as an Apache module. Use
       <function>phpinfo</function> to see a list of all of the
       environment variables defined this way.
      </para>
     </note>
    </para>
    <para>
     <example>
      <title><function>getallheaders</function> Example</title>
      <programlisting role="php">
<![CDATA[
$headers = getallheaders();
while (list ($header, $value) = each ($headers)) {
    echo "$header: $value<br />\n";
}
]]>
      </programlisting>
     </example>
    </para>
    <para>
     This example will display all the request headers for the current
     request.
     <note>
      <simpara>
       <function>getallheaders</function> is currently only supported
       when PHP runs as an <productname>Apache</productname> module.
      </simpara>
     </note>
    </para>
   </refsect1>
  </refentry>

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