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

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