无法从多维数组PHP中删除空值

Question

My multi-dimensional array looks like this:

Array
(
[0] => Array
    (
        [0] => 2010-12-03
        [1] => 0
        [2] => Array
            (
                [0] => Array
                    (
                        [0] => 
                        [1] => 
                        [2] => 0
                        [3] => 
                        [4] => 
                    )

                [1] => Array
                    (
                        [0] => 
                        [1] => 
                        [2] => 0
                        [3] => 
                        [4] => 
                    )

                [2] => Array
                    (
                        [0] => 
                        [1] => 
                        [2] => 0
                        [3] => 
                        [4] => 
                    )

                [3] => Array
                    (
                        [0] => 
                        [1] => 
                        [2] => 0
                        [3] => 
                        [4] => 
                    )

                [4] => Array
                    (
                        [0] => 
                        [1] => 
                        [2] => 0
                        [3] => 
                        [4] => 
                    )

                [5] => Array
                    (
                        [0] => 
                        [1] => 
                        [2] => 0
                        [3] => 
                        [4] => 
                    )

            )

    )

[1] => Array
    (
        [0] => 2010-12-10
        [1] => 486
        [2] => Array
            (
                [0] => Array
                    (
                        [0] => Bob
                        [1] => Lucy
                        [2] => 54
                        [3] => Y
                        [4] => PC1Clean
                    )

                [1] => Array
                    (
                        [0] => Jo
                        [1] => Mary
                        [2] => 432
                        [3] => Y
                        [4] => PC2Bar
                    )

                [2] => Array
                    (
                        [0] => 
                        [1] => 
                        [2] => 0
                        [3] => 
                        [4] => 
                    )

                [3] => Array
                    (
                        [0] => 
                        [1] => 
                        [2] => 0
                        [3] => 
                        [4] => 
                    )

                [4] => Array
                    (
                        [0] => 
                        [1] => 
                        [2] => 0
                        [3] => 
                        [4] => 
                    )

                [5] => Array
                    (
                        [0] => 
                        [1] => 
                        [2] => 0
                        [3] => 
                        [4] => 
                    )

            )

    )

I've tried array_filter and different loop iterations to remove the zero / null values, such as

function removeElementWithValue($array, $key, $value) {
    foreach($array as $subKey => $subArray) {
        if($subArray[$key] == $value) {
            unset($array[$subKey]);
        }
    }
}

But nothing seems to be working. Any help would be much appreciated!

Answer 1

You need to recursively call your remove function. ( Call the function for every sub-value in the array, and then the function will call itself for every sub-sub-value etc. automatically until it can't get any further down the tree ).

Here's a quickly made (untested) function that should remove all empty values (including arrays, if they're empty):

function removeEmptyElements($array) {
    foreach ($array as $key => $value){
        if (empty($value)) {
            unset($array[$key]);
        } else if (is_array($value)) {
            $array[$key] = removeEmptyElements($value);
        }
    }
    return $array;
}

Answer 2

Maybe this answer is a bit too late, but here it is:

$array = array( // array with examples
    array('123',' 456', array(123, null)),
    array('', null, '123'),
    123,
    234,
    0,
    null,
); 

$filterEmptyValues = function($val) use (&$filterEmptyValues) {
    foreach($val as $key => $value) {
        if (!is_array($value)) {
            if (!$value) unset($val[$key]);
        }
        else $val[$key] = call_user_func($filterEmptyValues, $value);
    }
    return $val;
};


$array = $filterEmptyValues($array) ;

print_r($array);