By declaring $a and $b global within the function, all references to either variable will refer to the global version. There is no limit to the number of global variables that can be manipulated by a function.

Some predefined variables in PHP are "superglobals", which means that they are always accessible, regardless of scope - and you can access them from any function, class or file without having to do …

Jul 11, 2025 · Global variables refer to any variable that is defined outside of the function. Global variables can be accessed from any part of the script i.e. inside and outside of the function.

An associative array containing references to all variables which are currently defined in the global scope of the script. The variable names are the keys of the array.

In this detailed course page, we’ll explore PHP Global Variables, which are a fundamental concept in PHP programming. Understanding global variables is essential because they allow data to be …

In PHP, any variable that can be accessed from anywhere in a PHP script is called as a global variable. If the variable is declared outside all the functions or classes in the script, it becomes a global variable.

Apr 16, 2025 · PHP global keyword tutorial shows how to use global variables in PHP. Learn variable scope with practical examples.

An associative array containing references to all variables which are currently defined in the global scope of the script. The variable names are the keys of the array.

Aug 11, 2025 · What Are PHP Superglobals? Superglobals are predefined variables in PHP that are accessible from any scope — whether inside functions, classes, or files — without using the global …

PHP The global Keyword The global keyword is used to access a global variable from within a function. To do this, use the global keyword before the variables (inside the function):