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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.21 $ -->
<chapter id="features.cookies">
<title>Cookies</title>
<para>
PHP transparently supports <acronym>HTTP</acronym> 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> or
<function>setrawcookie</function>
function. Cookies are part of the <acronym>HTTP</acronym> 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 included into
a <link linkend="reserved.variables.cookies">$_COOKIE</link> auto-global
array if <link linkend="ini.variables-order">variables_order</link>
contains "C". If you wish to assign multiple values to a single
cookie, just add <literal>[]</literal> to the cookie name.
</para>
<para>
Depending on <link linkend="ini.register-globals">register_globals</link>,
regular PHP variables can be created from cookies. However it's not
recommended to rely on them as this feature is often turned off for the
sake of security.
<varname>$HTTP_COOKIE_VARS</varname> is also set in earlier versions of PHP
when the <link linkend="ini.track-vars">track_vars</link> configuration
variable is set. (This setting is always on since PHP 4.0.3.)
</para>
<para>
For more details, including notes on browser bugs, see the
<function>setcookie</function> and <function>setrawcookie</function>
function.
</para>
</chapter>
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