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<?php $o = new stdClass(); $five = 5; $six = 6; $o->$five = 5; $o->$six = 6; $a = (array)$o; var_dump($a, $a[5]);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [5]=> int(5) [6]=> int(6) } int(5)

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