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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xml:id="function.apc-add" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>apc_add</refname>
<refpurpose>
Cache a variable in the data store
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>apc_add</methodname>
<methodparam><type>string</type><parameter>key</parameter></methodparam>
<methodparam><type>mixed</type><parameter>var</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>ttl</parameter><initializer>0</initializer></methodparam>
</methodsynopsis>
<para>
Caches a variable in the data store, only if it's not already stored.
</para>
<note>
<simpara>
Unlike many other mechanisms in PHP, variables stored using
<function>apc_add</function> will persist between requests (until the
value is removed from the cache).
</simpara>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>key</parameter></term>
<listitem>
<para>
Store the variable using this name. <parameter>key</parameter>s are
cache-unique, so attempting to use <function>apc_add</function> to
store data with a key that already exists will not overwrite the
existing data, and will instead return &false;. (This is the only
difference between <function>apc_add</function> and
<function>apc_store</function>.)
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>var</parameter></term>
<listitem>
<para>
The variable to store
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>ttl</parameter></term>
<listitem>
<para>
Time To Live; store <parameter>var</parameter> in the cache for
<parameter>ttl</parameter> seconds. After the
<parameter>ttl</parameter> has passed, the stored variable will be
expunged from the cache (on the next request). If no <parameter>ttl</parameter>
is supplied (or if the <parameter>ttl</parameter> is
<literal>0</literal>), the value will persist until it is removed from
the cache manually, or otherwise fails to exist in the cache (clear,
restart, etc.).
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>A <function>apc_add</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$bar = 'BAR';
apc_add('foo', $bar);
var_dump(apc_fetch('foo'));
echo "\n";
$bar = 'NEVER GETS SET';
apc_add('foo', $bar);
var_dump(apc_fetch('foo'));
echo "\n";
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
string(3) "BAR"
string(3) "BAR"
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>apc_store</function></member>
<member><function>apc_fetch</function></member>
<member><function>apc_delete</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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