Superglobals

Superglobals

Superglobals — Superglobals are built-in variables that are always available in all scopes

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 설명

Several predefined variables in PHP are "superglobals", which means they are available in all scopes throughout a script. There is no need to do global $variable; to access them within functions or methods.

These superglobal variables are:

• $GLOBALS
• $_SERVER
• $_GET
• $_POST
• $_FILES
• $_COOKIE
• $_SESSION
• $_REQUEST
• $_ENV

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 변경점

버전	설명
4.1.0	Superglobals were introduced to PHP.

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 주의

Note: Variable availability
By default, all of the superglobals are available but there are directives that affect this availability. For further information, refer to the documentation for variables_order. 

Note: Dealing with register_globals
If the deprecated register_globals directive is set to on then the variables within will also be made available in the global scope of the script. For example, $_POST['foo'] would also exist as $foo. 
For related information, see the FAQ titled "How does register_globals affect me?" 

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

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 참고

• variable scope
• The variables_order directive
• The filter extension