@ 2016-07-19T14:46:07Z <?php
$array = [ 0 => 'apple', 'b' => 'banana', 3 => 'cow', 'wrench' => 'duck', ];
$filtered = array_filter(
$array,
function ($k) { return is_numeric($k); }, // test to include only numeric keyed
ARRAY_FILTER_USE_KEY // new in PHP 5.6
);
var_dump($filtered);
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Output for 5.6.0 - 5.6.40 , 7.0.0 - 7.0.33 , 7.1.0 - 7.1.33 , 7.2.0 - 7.2.34 , 7.3.0 - 7.3.33 , 7.4.0 - 7.4.33 , 8.0.0 - 8.0.30 , 8.1.0 - 8.1.30 , 8.2.0 - 8.2.24 , 8.3.0 - 8.3.12 array(2) {
[0]=>
string(5) "apple"
[3]=>
string(3) "cow"
}
Output for 5.5.0 - 5.5.38 Notice: Use of undefined constant ARRAY_FILTER_USE_KEY - assumed 'ARRAY_FILTER_USE_KEY' in /in/7KjaV on line 9
Warning: array_filter() expects at most 2 parameters, 3 given in /in/7KjaV on line 9
NULL
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81.1 ms | 407 KiB | 5 Q