Predefined Variables

Predefined Variables

PHP provides a number of
.
PHP also provides an additional set of predefined arrays
containing variables from the web server (if applicable), the
environment, and user input. These arrays are automatically available in
every scope. For this reason, they are often known as
"superglobals". (There is no mechanism in PHP for
user-defined superglobals.) Refer to the

for details.

predefined variableslist of superglobals

Opmerking: > ### Variable variables

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

If certain variables in  are not set, their
appropriate PHP predefined arrays are also left empty.

variables_order