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<?php $in = "1234"; $arr = array($in => "foobar"); $keys = array_keys($arr); $out = $keys[0]; var_dump($keys); var_dump($in == $out); var_dump($in === $out); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> int(1234) } bool(true) bool(false)