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<?php $a=array("x", "y", "z"); $b=$a; array_unshift($b,"m"); print_r($a); print_r($b);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => x [1] => y [2] => z ) Array ( [0] => m [1] => x [2] => y [3] => z )