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<?php var_dump(array_map('array_keys', compact( '_ENV', '_GET', '_POST', '_COOKIE', '_SERVER' )));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: compact(): Undefined variable $_ENV in /in/7J896 on line 3 array(4) { ["_GET"]=> array(0) { } ["_POST"]=> array(0) { } ["_COOKIE"]=> array(0) { } ["_SERVER"]=> array(17) { [0]=> string(4) "TERM" [1]=> string(4) "PATH" [2]=> string(4) "LANG" [3]=> string(5) "SHELL" [4]=> string(4) "MAIL" [5]=> string(7) "LOGNAME" [6]=> string(4) "USER" [7]=> string(4) "HOME" [8]=> string(8) "PHP_SELF" [9]=> string(11) "SCRIPT_NAME" [10]=> string(15) "SCRIPT_FILENAME" [11]=> string(15) "PATH_TRANSLATED" [12]=> string(13) "DOCUMENT_ROOT" [13]=> string(18) "REQUEST_TIME_FLOAT" [14]=> string(12) "REQUEST_TIME" [15]=> string(4) "argv" [16]=> string(4) "argc" } }

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