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<?php $foo = ["a", "b", "c"]; foreach ($foo as &$bar) { $bar = 1; } var_dump($foo); $bar = 2; var_dump($foo); unset($bar); $bar = 3; var_dump($foo);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
array(3) { [0]=> int(1) [1]=> int(1) [2]=> &int(1) } array(3) { [0]=> int(1) [1]=> int(1) [2]=> &int(2) } array(3) { [0]=> int(1) [1]=> int(1) [2]=> int(2) }