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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.13 $ -->
<chapter id="features.cookies">
<title>Cookies</title>
<para>
PHP transparently supports HTTP cookies. Cookies are a mechanism
for storing data in the remote browser and thus tracking
or identifying return users. You can set cookies using the
<function>setcookie</function> function. Cookies are part of the
HTTP header, so <function>setcookie</function> must be called before
any output is sent to the browser. This is the same limitation that
<function>header</function> has. You can use the <link
linkend="ref.outcontrol">output buffering functions</link> to delay the
script output until you have decided whether or not to set any cookies or
send any headers.
</para>
<para>
Any cookies sent to you from the client will automatically be turned into a
PHP variable just like GET and POST method data, depending on the
<literal>register_globals</literal> and <literal>variables_order</literal>
configuration variables. If you wish to assign multiple values to a single
cookie, just add <emphasis>[]</emphasis> to the cookie name.
</para>
<para>
In PHP 4.1.0 and later, the <literal>$_COOKIE</literal> auto-global
array will always be set with any cookies sent from the client.
<literal>$HTTP_COOKIE_VARS</literal> is also set in earlier versions of PHP
when the <literal>track_vars</literal> configuration variable is set.
</para>
<para>
For more details, including notes on browser bugs, see the
<function>setcookie</function> function.
</para>
</chapter>
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