How to delete global variables by php

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Php delete global variables method: 1, open the corresponding PHP code file; 2, find global variables; 3, through the "unset ($db,$user);" method to delete global variables.

This article operating environment: windows7 system, PHP7.1 version, Dell G3 computer.

Global only declares references to global variables in the function

Php will release all resources, including variables, at the end of the program.

$function destruction

Global $db;global $user;unset ($db,$user)

Related introduction:

Hyperglobal variables, introduced in PHP 4.1.0, are built-in variables that are always available in all scopes.

PHP global variable-super global variable

Many of the predefined variables in PHP are "super-global", which means they are available in all scopes of a script. You can access them in functions or methods without executing global $variable;.

These superglobal variables are:

The above $GLOBALS$_SERVER$_REQUEST$_POST$_GET$_FILES$_ENV$_COOKIE$_SESSION is all the contents of the article "how to delete global variables by php". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!