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run code in 150+ php & hhvm versions
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<?php $values = array('a'=>'foo','b'=>null,'c'=>'bar','d'=>''); foreach ($values as $field=>&$value) { if ($value === null || $value == '') { $value = null; continue; } $value = 'OK:'.$value; } unset($value); var_dump($values); ?>
Output for 5.2.1 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { ["a"]=> string(6) "OK:foo" ["b"]=> NULL ["c"]=> string(6) "OK:bar" ["d"]=> NULL }
Output for 5.0.0 - 5.2.0
array(4) { ["a"]=> &string(6) "OK:foo" ["b"]=> &NULL ["c"]=> &string(6) "OK:bar" ["d"]=> NULL }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/PQl8E on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/PQl8E 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/PQl8E on line 3
Process exited with code 255.