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<?php $arr = array(7, NAN, 3, 2, 18); $result = sort($arr); var_dump($result); var_dump($arr);
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) array(5) { [0]=> int(2) [1]=> float(NAN) [2]=> int(3) [3]=> int(7) [4]=> int(18) }

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