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<refentry xml:id="function.apache-getenv" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>apache_getenv</refname>
  <refpurpose>Get an Apache subprocess_env variable</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>apache_getenv</methodname>
   <methodparam><type>string</type><parameter>variable</parameter></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>walk_to_top</parameter><initializer>false</initializer></methodparam>
  </methodsynopsis>
  <para>
   Retrieve an Apache environment variable specified by 
   <parameter>variable</parameter>.
  </para>
  <para>
   This function requires Apache 2 otherwise it's undefined.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>variable</parameter></term>
     <listitem>
      <para>
       The Apache environment variable
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>walk_to_top</parameter></term>
     <listitem>
      <para>
       Whether to get the top-level variable available to all Apache layers.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   The value of the Apache environment variable on success, or &false; on
   failure
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>apache_getenv</function> example</title>
    <para>
     The example above shows how to retrieve the value of the Apache
     environment variable <varname>SERVER_ADDR</varname>.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
$ret = apache_getenv("SERVER_ADDR");
echo $ret;
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
42.24.42.240
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>apache_setenv</function></member>
    <member><function>getenv</function></member>
    <member><link linkend="language.variables.superglobals">Superglobals</link></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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