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run code in 150+ php & hhvm versions
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<?php $arr1 = array("a"=>1, "b"=>2, "c"=>3); $arr2 = array("x"=>4, "y"=>5, "z"=>6); foreach($arr1 as $key => &$val) {} foreach($arr2 as $key => $val) {} var_dump($arr1); var_dump($arr2);
Output for 5.2.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> &int(6) } array(3) { ["x"]=> int(4) ["y"]=> int(5) ["z"]=> int(6) }
Output for hhvm-3.10.0

Process exited with code 137.
Output for 5.0.0 - 5.2.0
array(3) { ["a"]=> &int(1) ["b"]=> &int(2) ["c"]=> &int(6) } array(3) { ["x"]=> int(4) ["y"]=> int(5) ["z"]=> int(6) }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/OBTTJ on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/OBTTJ on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/OBTTJ on line 6
Process exited with code 255.