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<?php $array = [ ['a' => 1, 'b' => 2], ['a' => 2, 'b' => 2] ]; $data = new stdClass(['count'=>0,'a'=>0,'b'=>0]); var_dump($data); $cb = function($value, $key, &$data) { $data['count'] = $data['count'] + 1; $data['a'] = $data['a'] + $value['a']; $data['b'] = $data['b'] + $value['b']; }; array_walk($array, $cb, $data);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
object(stdClass)#1 (0) { } Warning: {closure}(): Argument #3 ($data) must be passed by reference, value given in /in/OHSDK on line 18 Fatal error: Uncaught Error: Cannot use object of type stdClass as array in /in/OHSDK:13 Stack trace: #0 [internal function]: {closure}(Array, 0, Object(stdClass)) #1 /in/OHSDK(18): array_walk(Array, Object(Closure), Object(stdClass)) #2 {main} thrown in /in/OHSDK on line 13
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
object(stdClass)#1 (0) { } Fatal error: Uncaught Error: Cannot use object of type stdClass as array in /in/OHSDK:13 Stack trace: #0 [internal function]: {closure}(Array, 0, Object(stdClass)) #1 /in/OHSDK(18): array_walk(Array, Object(Closure), Object(stdClass)) #2 {main} thrown in /in/OHSDK on line 13
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21
object(stdClass)#1 (0) { } Fatal error: Cannot use object of type stdClass as array in /in/OHSDK on line 13
Process exited with code 255.
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/OHSDK 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 '[' in /in/OHSDK on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/OHSDK on line 3
Process exited with code 255.

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