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<?php $x = 123; $a = array(array(&$x, 'hi')); $b = $a; var_dump($a, $b); $b[0][0]++; var_dump($a, $b);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> array(2) { [0]=> &int(123) [1]=> string(2) "hi" } } array(1) { [0]=> array(2) { [0]=> &int(123) [1]=> string(2) "hi" } } array(1) { [0]=> array(2) { [0]=> &int(124) [1]=> string(2) "hi" } } array(1) { [0]=> array(2) { [0]=> &int(124) [1]=> string(2) "hi" } }