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:
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: 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
© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/language.variables.superglobals.php