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<?php $a = ['a' => 'a', 'b' => 'b']; foreach ($a as &$value) { $value = 'C'; } $value = 'D'; //$value is still bound by-reference echo 'Unintended Results: ' . PHP_EOL; var_dump($a); echo PHP_EOL; $a = ['a' => 'a', 'b' => 'b']; foreach ($a as &$value) { $value = 'C'; } unset($value); $value = 'D'; echo 'Expected Results: ' . PHP_EOL; var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
Unintended Results: array(2) { ["a"]=> string(1) "C" ["b"]=> &string(1) "D" } Expected Results: array(2) { ["a"]=> string(1) "C" ["b"]=> string(1) "C" }

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