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run code in 150+ php & hhvm versions
Bugs & Features
<?php $arr = array(0,null,3,null); foreach ($arr as &$row) { if ($row == null) unset($row); } var_dump($arr);
Output for 5.2.1 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> int(0) [1]=> NULL [2]=> int(3) [3]=> NULL }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.0
array(4) { [0]=> int(0) [1]=> NULL [2]=> &int(3) [3]=> NULL }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/gJD5p on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/gJD5p on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/gJD5p on line 4
Process exited with code 255.