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<?php $a = ['a' => 1, 2 => 2, '3' =>3, 4 => '4']; var_dump(array_keys($a));
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> string(1) "a" [1]=> int(2) [2]=> int(3) [3]=> int(4) }

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