Superglobals

Superglobals

Superglobals — Superglobals are built-in variables that are always available in all scopes

Description

Several predefined variables in PHP are "superglobals", which means they are available in all scopes throughout a script. There is no need to do global $variable; to access them within functions or methods.

These superglobal variables are:

• $GLOBALS

• $_SERVER

• $_GET

• $_POST

• $_FILES

• $_COOKIE

• $_SESSION

• $_REQUEST

• $_ENV

Changelog

Notes

Note: Variable availability By default, all of the superglobals are available but there are directives that affect this availability. For further information, refer to the documentation for variables_order.

Note: Dealing with register_globals If the deprecated register_globals directive is set to on then the variables within will also be made available in the global scope of the script. For example, $_POST['foo'] would also exist as $foo. For related information, see the FAQ titled "How does register_globals affect me?"

Note: Variable variables Superglobals cannot be used as variable variables inside functions or class methods.

See Also

• variable scope

• The variables_order directive

• The filter extension

← Predefined Variables

$GLOBALS →

 © 1997–2017 The PHP Documentation Group

Licensed under the Creative Commons Attribution License v3.0 or later.

https://secure.php.net/manual/en/language.variables.superglobals.php