klawisze specyficzne dla filtru tablicy PHP
$arr = [
'foo' => 'bar',
1 => 'baz',
'qux' => 22,
3 => 123,
'quux' => 'quuz',
];
$filteredArr = array_filter(
$arr,
fn ($key) => is_numeric($key),
ARRAY_FILTER_USE_KEY
);
echo print_r($filteredArr, true); // [1 => 'baz', 3 => 123]
Coder Khayrul