3v4l.org

run code in 300+ PHP versions simultaneously
<?php $pole['nullak'] = null; unset($pole['nullak']); // unset null foreach ($pole as &$key => $val) { echo "'$key' je '$val'"; } // reference na klici
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.32
Fatal error: Key element cannot be a reference in /in/0nQVl on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/0nQVl on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/0nQVl on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/0nQVl on line 4
Process exited with code 255.
preferences:
232.63 ms | 1395 KiB | 123 Q