3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $arr = array( 'a' => 'A', 'b' => 'B', 'c' => 'C'); var_dump($arr); // Taking "$val" as a reference here allows modifying the parent hashtable // directly, i.e. the $val ref "knows" its parent key in some sense foreach ($arr as &$val) { if ($val == 'B') { $val = 'X'; } } var_dump($arr); // However, it doesn't allow you to unset the parent key... foreach ($arr as &$val) { if ($val == 'B') { unset($arr[2]); } } var_dump($arr);
Output for 5.2.1 - 5.6.22, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { ["a"]=> string(1) "A" ["b"]=> string(1) "B" ["c"]=> string(1) "C" } array(3) { ["a"]=> string(1) "A" ["b"]=> string(1) "X" ["c"]=> &string(1) "C" } array(3) { ["a"]=> string(1) "A" ["b"]=> string(1) "X" ["c"]=> &string(1) "C" }
Output for 5.0.0 - 5.2.0
array(3) { ["a"]=> string(1) "A" ["b"]=> string(1) "B" ["c"]=> string(1) "C" } array(3) { ["a"]=> &string(1) "A" ["b"]=> &string(1) "X" ["c"]=> &string(1) "C" } array(3) { ["a"]=> &string(1) "A" ["b"]=> &string(1) "X" ["c"]=> &string(1) "C" }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/K7TXM on line 12
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 '$' in /in/K7TXM on line 12
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/K7TXM on line 12
Process exited with code 255.