3v4l.org

run code in 300+ PHP versions simultaneously
<?php $fibMemo = call_user_func(function () { $memo = array(0 => 0, 1 => 1); $fib = function ($n) use (&$memo, &$fib) { if (!isset($memo[$n])) { $memo[$n] = $fib($n - 1) + $fib($n - 2); } return $memo[$n]; }; return $fib; }); echo $fibMemo(10);
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
55
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/mTrO4 on line 5
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, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/mTrO4 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/mTrO4 on line 5
Process exited with code 255.
preferences:
222.84 ms | 401 KiB | 357 Q