php predefined variables

For all scripts, PHP provides a large number of predefined variables. These variables represent all external variables as built-in environment variables and error messages as return headers.

Super global variables — Super global variables are built-in variables that are always available in all scopes

$GLOBALS — References all variables available in the global scope

$_SERVER — Server and execution environment information

$_GET — HTTP GET variable _ $ _post - http post variables

$ _Files -http file upload variables

$ _Request — Http Request variables

$ _Session

$ _NV

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g $ PHP_ERRORMSG —— Previous error information