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<?php $GLOBALS[""] = true; var_dump(array_keys(get_defined_vars()));
Output for git.master_jit, git.master
array(8) { [0]=> string(4) "_GET" [1]=> string(5) "_POST" [2]=> string(7) "_COOKIE" [3]=> string(6) "_FILES" [4]=> string(4) "argv" [5]=> string(4) "argc" [6]=> string(7) "_SERVER" [7]=> string(0) "" }

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