如果php中没有值，如何使数组为空？

Question

Array
(
    [0] => Array
        (
            [ratio] => 
        )

    [1] => Array
        (
            [ratio] => 
        )

)

This is the array coming while posting data. I want to make this array null i.e. array(). how i can i make it if no values are present ?

Answer 1

To remove all inner "empty" arrays, map an array_filter across the array:

array_map('array_filter', $arr)

→ [[], []]

To remove those empty arrays completely, array_filter that result:

$arr = [['ratio' => null], ['ratio' => null]];
$result = array_filter(array_map('array_filter', $arr));

→ []