Online PHP editor | output for IlN3q

Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 1 passed and exactly 2 expected in /in/IlN3q:2 Stack trace: #0 [internal function]: {closure}('bar') #1 /in/IlN3q(2): array_map(Object(Closure), Array) #2 {main} thrown in /in/IlN3q on line 2
Process exited with code 255.
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28: Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 1 passed and exactly 2 expected in /in/IlN3q:2 Stack trace: #0 [internal function]: {closure}('bar') #1 /in/IlN3q(4): array_map(Object(Closure), Array) #2 {main} thrown in /in/IlN3q on line 2
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20: Warning: Missing argument 2 for {closure}() in /in/IlN3q on line 2 Notice: Undefined variable: a in /in/IlN3q on line 3 Notice: Undefined variable: b in /in/IlN3q on line 3 array(1) { ["foo"]=> array(2) { [0]=> NULL [1]=> NULL } }
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/IlN3q 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 T_FUNCTION, expecting ')' in /in/IlN3q on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `')'' in /in/IlN3q on line 2
Process exited with code 255.