(PHP 4 >= 4.1.0, PHP 5, PHP 7) HTTP Request variables
(PHP 4 >= 4.1.0, PHP 5, PHP 7) Session variables
(PHP 4 >= 4.0.4, PHP 5, PHP 7) HTTP response headers
(PHP 4 >= 4.1.0, PHP 5, PHP 7) HTTP File Upload variables
(PHP 4, PHP 5, PHP 7) The number of arguments passed to script
(PHP 4, PHP 5, PHP 7) References all variables available in global scope
(PHP 4, PHP 5) Raw POST data
(PHP 4 >= 4.1.0, PHP 5, PHP 7) HTTP Cookies An
(PHP 4 >= 4.1.0, PHP 5, PHP 7) Server and execution environment information
(PHP 4 >= 4.1.0, PHP 5, PHP 7) HTTP POST variables
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