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<?php class D { public $first = 'test'; public $second = 12; public $third = false; public $forth = '0xa'; public $fifth = null; } $o = new D(); var_dump(array_keys((array) $o));
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { [0]=> string(5) "first" [1]=> string(6) "second" [2]=> string(5) "third" [3]=> string(5) "forth" [4]=> string(5) "fifth" }

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