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run code in 200+ php & hhvm versions
Bugs & Features
<?php $list = array("A","B","C","D"); $childList = $list; foreach ( $childList as &$var ) { cleanChild($childList, $list); $childList = $list; } echo "\n"; function cleanChild(&$childList, &$list) { foreach ($childList as $key => $childVar) { if ($childVar == 'B') { unset($list[$key]); } } } ?>
Output for 5.2.2 - 5.6.28, 7.0.2 - 7.2.0

Process exited with code 137.
Output for 5.0.0 - 5.2.1, 7.0.0 - 7.0.1
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/A40Ib on line 6
Process exited with code 255.
Output for 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/A40Ib on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/A40Ib on line 6
Process exited with code 255.
Output for 4.3.0
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/fL505 on line 6
Process exited with code 255.