How can arrays be effectively filtered in PHP to remove null values?

To effectively filter arrays in PHP to remove null values, you can use the array_filter() function along with a custom callback function that checks for null values. The callback function should return false for null values to filter them out of the array.

// Original array with null values
$array = [1, 2, null, 4, null, 6];

// Filter out null values
$array = array_filter($array, function($value) {
    return $value !== null;
});

// Output filtered array
print_r($array);