3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function cluster($array) { $array = array_reverse($array); foreach($array as $element) { $newarray = [$element=>$newarray]; } return $newarray; } var_dump(cluster(['A', 'B', 'C', 'D','E','F','G','H','I']));
based on JkP31
Output for 5.4.0 - 7.1.0
Notice: Undefined variable: newarray in /in/OIqvH on line 5 array(1) { ["A"]=> array(1) { ["B"]=> array(1) { ["C"]=> array(1) { ["D"]=> array(1) { ["E"]=> array(1) { ["F"]=> array(1) { ["G"]=> array(1) { ["H"]=> array(1) { ["I"]=> NULL } } } } } } } } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/OIqvH on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/OIqvH on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/OIqvH on line 5
Process exited with code 255.