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<?php $a = ['a' => 5, 'b' => 10]; $f = function ($value, $key) { return $key === 'a' && $value = 5; }; var_dump(array_filter($a, $f, ARRAY_FILTER_USE_BOTH));
Output for 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.17 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
array(1) { ["a"]=> int(5) }
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35
Notice: Use of undefined constant ARRAY_FILTER_USE_BOTH - assumed 'ARRAY_FILTER_USE_BOTH' in /in/Mk23R on line 9 Warning: array_filter() expects at most 2 parameters, 3 given in /in/Mk23R on line 9 NULL
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/Mk23R 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/Mk23R on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Mk23R on line 3
Process exited with code 255.

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