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run code in 150+ php & hhvm versions
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<?php $arr = array('1', '2', '3'); z($arr); function z($arr) { foreach ($arr as $key=>&$val) { $arr[3] = '999'; echo $val."\n"; } } var_dump($arr);
Output for 5.2.2 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
1 2 3 999 array(3) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.1
1 2 3 array(3) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/F8rrH on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/F8rrH on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/F8rrH on line 7
Process exited with code 255.