(PECL runkit >= 0.7.0)
runkit_superglobals — Return numerically indexed array of registered superglobals
array runkit_superglobals ( void )
Returns a numerically indexed array of the currently registered superglobals. i.e. _GET, _POST, _REQUEST, _COOKIE, _SESSION, _SERVER, _ENV, _FILES
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https://secure.php.net/manual/en/function.runkit-superglobals.php