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What are global variable in php ?

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Digital Marketing Trainer with 9 years of experience

Global Variable we can declare the outside the function and another page .The PHP super global variables are: $GLOBALS $_SERVER $_REQUEST $_POST $_GET $_FILES $_ENV $_COOKIE $_SESSION
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Excel VBA Expert

A variable declared outside a function is global
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Java Trainer Bhopal

Request, get, post, session are global variable in php.
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PHP Developer/Trainer with 4 years of experience

Global variables are predefined in PHP core engine library. These variables are accessed from any where regardless of scope, global variables starts with '$_', these are also known as superglobals. ex. $_POST, $_GET, $_SESSION, $_COOKIE etc.,
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Web Application Development

Global variable like a variable which access in all Classes and function in librery
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PHP Global Variables - Superglobals Several 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. The PHP superglobal variables are: $GLO...
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PHP Global Variables - Superglobals Several 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. The PHP superglobal variables are: $GLOBALS $_SERVER $_REQUEST $_POST $_GET $_FILES $_ENV $_COOKIE $_SESSION read less
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Exp. Web Develop with 3 yr. Experience.

Gobal variables are those that have global scope through out the whole program it means it's accessibility not limited to function only, it can be accessed through out the running of program.
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IT Professional Trainer with 15 years of experience in IT Industry

Global variables are set by a PHP script author to assure that a variable and its value will be available inside of a function, or when another PHP file is called to manipulate that variable. When you create custom variables in the normal fashion those variables and their values will not be available...
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Global variables are set by a PHP script author to assure that a variable and its value will be available inside of a function, or when another PHP file is called to manipulate that variable. When you create custom variables in the normal fashion those variables and their values will not be available to you inside of a function or an externally called file. To make sure they are available you create the variable in the normal way and then apply the following code to make global and available to cover more scope only when needed. read less
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Computer Programming

It is visible (hence accessible) throughout the program.
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Global variables are shared across application by defining global.
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