Online PHP editor | output for 6uE5n

Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.7: Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback or null, class "derp.php" not found in /in/6uE5n:4 Stack trace: #0 /in/6uE5n(4): array_map(Array, Object(Closure)) #1 {main} thrown in /in/6uE5n on line 4
Process exited with code 255.
Output for 8.1.0 - 8.1.28: Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback or null, class "derp.php" not found in /in/6uE5n:6 Stack trace: #0 /in/6uE5n(6): array_map(Array, Object(Closure)) #1 {main} thrown in /in/6uE5n on line 6
Process exited with code 255.
Output for 8.0.0 - 8.0.30: Fatal error: Uncaught TypeError: array_map(): Argument #1 ($callback) must be a valid callback, class "derp.php" not found in /in/6uE5n:6 Stack trace: #0 /in/6uE5n(6): array_map(Array, Object(Closure)) #1 {main} thrown in /in/6uE5n on line 6
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Warning: array_map() expects parameter 1 to be a valid callback, class 'derp.php' not found in /in/6uE5n on line 6 array(2) { [0]=> string(8) "derp.php" [1]=> string(8) "test.php" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/6uE5n on line 2
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 '[' in /in/6uE5n on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/6uE5n on line 2
Process exited with code 255.