3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $memoize = function ($fn, $cacheKeyFn = null, $limit = null) { $cache = array(); return function () use ($fn, $cacheKeyFn, $limit, & $cache) { $args = func_get_args(); if ($cacheKeyFn) { $key = call_user_func_array($cacheKeyFn, $args); } else { $key = reset($args); } if (isset($cache[$key])) { return $cache[$key]; } $result = call_user_func_array($fn, $args); if ($limit !== null && count($cache) === $limit) { array_shift($cache); } $cache[$key] = $result; return $result; }; }; $numCalls = 0; $memoFib = $memoize( function ($n) use (& $memoFib, & $numCalls) { $numCalls++; if ($n === 1 || $n === 2) return 1; return $memoFib($n - 1) + $memoFib($n - 2); } ); foreach (range(0,1) as $i) { $memoFib($i); }
Output for 7.1.0
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 20480 bytes) in /in/F02pt on line 6
Process exited with code 255.
Output for 7.0.0 - 7.0.14
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 262144 bytes) in /in/F02pt on line 29
Process exited with code 255.
Output for hhvm-3.10.0 - 3.12.0
Fatal error: Stack overflow in /in/F02pt on line 29
Process exited with code 255.
Output for 5.3.0 - 5.6.28

Process exited with code 139.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/F02pt on line 3
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 T_FUNCTION in /in/F02pt on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/F02pt on line 3
Process exited with code 255.