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<?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); } ); echo $memoFib(0) . PHP_EOL; echo $memoFib(1) . PHP_EOL;
Output for 7.4.3 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.1, 8.1.28, 8.2.18, 8.3.5 - 8.3.6
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 262144 bytes) in /in/nafJt on line 10
Process exited with code 255.
Output for 8.2.14 - 8.2.17, 8.3.1 - 8.3.4
Fatal error: Out of memory (allocated 31457280 bytes) (tried to allocate 4096 bytes) in /in/nafJt on line 6 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 8.2.0 - 8.2.13, 8.3.0
Fatal error: Out of memory (allocated 31457280 bytes) (tried to allocate 4096 bytes) in /in/nafJt on line 5 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 8.1.2 - 8.1.27
Fatal error: Out of memory (allocated 31457280) (tried to allocate 4096 bytes) in /in/nafJt on line 10 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 8.0.13
Fatal error: Out of memory (allocated 130023424) (tried to allocate 262144 bytes) in /in/nafJt on line 10 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 262144 bytes) in /in/nafJt on line 6
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Fatal error: Out of memory (allocated 130023424) (tried to allocate 262144 bytes) in /in/nafJt on line 6 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 7.1.0 - 7.1.33
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 20480 bytes) in /in/nafJt on line 6
Process exited with code 255.
Output for 7.0.0 - 7.0.33
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 262144 bytes) in /in/nafJt on line 29
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40

Process exited with code 139.
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 in /in/nafJt on line 3
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 in /in/nafJt on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/nafJt on line 3
Process exited with code 255.
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