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run code in 150+ php & hhvm versions
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<?php $a = array('bar'); $xyz = 'foo'; $a = array_merge(array(&$xyz), $a); $xyz = 'baz'; var_dump($a);
Output for 4.3.0 - 7.1.0
array(2) { [0]=> &string(3) "baz" [1]=> string(3) "bar" }