Web Reference: 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. PHP Superglobals are built-in variables that are always accessible in all scopes! 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 anything special. 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.
YouTube Excerpt: In this video I will teach you about SUPERGLOBALS in
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