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<?php $x = new stdclass; $x->{42} = 1337; $x = (array)$x; var_dump($x); //$x = array("42" => 1337); foreach ($x as $key => $value) { var_dump($key); if (!array_key_exists((string)$key, $x)) echo 'wtf'; } ?>
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [42]=> int(1337) } int(42)

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