3v4l.org

run code in 150+ php & hhvm versions
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<?php $a = range(1,10); foreach ($a as &$n) { $n++; echo $n; } var_dump($a);
based on 81nnL
Output for 5.2.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
234567891011array(10) { [0]=> int(2) [1]=> int(3) [2]=> int(4) [3]=> int(5) [4]=> int(6) [5]=> int(7) [6]=> int(8) [7]=> int(9) [8]=> int(10) [9]=> &int(11) }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.0
234567891011array(10) { [0]=> &int(2) [1]=> &int(3) [2]=> &int(4) [3]=> &int(5) [4]=> &int(6) [5]=> &int(7) [6]=> &int(8) [7]=> &int(9) [8]=> &int(10) [9]=> &int(11) }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/0QMPO on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/0QMPO on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/0QMPO on line 3
Process exited with code 255.