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run code in 150+ php & hhvm versions
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<?php $arr = array('a', 'b'); foreach ($arr as &$a) { var_dump($a); } foreach ($arr as $a) { var_dump($a); }
based on TGZ0i
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(1) "a" string(1) "b" string(1) "a" string(1) "a"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/P1Omj on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/P1Omj on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/P1Omj on line 5
Process exited with code 255.