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<?php $arr = array(); $arr["a"] = "A"; $arr["b"] = "B"; $str = array_filter($arr, function($e1,$e2){ echo $e1.":".$e2; return $e1; }); var_dump($str);
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 1 passed and exactly 2 expected in /in/cKgLW:6 Stack trace: #0 [internal function]: {closure}('A') #1 /in/cKgLW(6): array_filter(Array, Object(Closure)) #2 {main} thrown in /in/cKgLW on line 6
Process exited with code 255.
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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/cKgLW:6 Stack trace: #0 [internal function]: {closure}('A') #1 /in/cKgLW(9): array_filter(Array, Object(Closure)) #2 {main} thrown in /in/cKgLW on line 6
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, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20
Warning: Missing argument 2 for {closure}() in /in/cKgLW on line 6 Notice: Undefined variable: e2 in /in/cKgLW on line 7 A: Warning: Missing argument 2 for {closure}() in /in/cKgLW on line 6 Notice: Undefined variable: e2 in /in/cKgLW on line 7 B:array(2) { ["a"]=> string(1) "A" ["b"]=> string(1) "B" }
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/cKgLW on line 6
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/cKgLW on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/cKgLW on line 6
Process exited with code 255.

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