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<?php $a = array_map(function($a) { return array_column($a, null); }, [['a' => 1]. ['b' => 2]]); var_dump($a);
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Array to string conversion in /in/cAK4i on line 5 Warning: Array to string conversion in /in/cAK4i on line 5 Fatal error: Uncaught TypeError: array_column(): Argument #1 ($array) must be of type array, string given in /in/cAK4i:4 Stack trace: #0 /in/cAK4i(4): array_column('ArrayArray', NULL) #1 [internal function]: {closure}('ArrayArray') #2 /in/cAK4i(3): array_map(Object(Closure), Array) #3 {main} thrown in /in/cAK4i on line 4
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Warning: Array to string conversion in /in/cAK4i on line 5 Warning: Array to string conversion in /in/cAK4i on line 5 Fatal error: Uncaught TypeError: array_column(): Argument #1 ($array) must be of type array, string given in /in/cAK4i:4 Stack trace: #0 /in/cAK4i(4): array_column('ArrayArray', NULL) #1 [internal function]: {closure}('ArrayArray') #2 /in/cAK4i(5): array_map(Object(Closure), Array) #3 {main} thrown in /in/cAK4i on line 4
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33
Notice: Array to string conversion in /in/cAK4i on line 5 Notice: Array to string conversion in /in/cAK4i on line 5 Warning: array_column() expects parameter 1 to be array, string given in /in/cAK4i on line 4 array(1) { [0]=> NULL }
Output for 7.3.32 - 7.3.33
Warning: array_column() expects parameter 1 to be array, string given in /in/cAK4i on line 4 array(1) { [0]=> NULL }
Output for 5.4.0 - 5.4.45
Notice: Array to string conversion in /in/cAK4i on line 5 Notice: Array to string conversion in /in/cAK4i on line 5 Fatal error: Call to undefined function array_column() in /in/cAK4i on line 4
Process exited with code 255.

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