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<?php function f() { $a = intval(1); $b = intval(2); $c = ($a & $b); var_dump($a); var_dump($b); var_dump($c); return array(($a & $b), $c, ($a & $b) === $a, $c === $a); } var_dump(f()); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) int(2) int(0) array(4) { [0]=> int(0) [1]=> int(0) [2]=> bool(false) [3]=> bool(false) }