Remove element from multidimensional indexed array by value using PHP

Question

I have array:

Array
(
    [5] => Array
        (
            [0] => 19
            [1] => 18
        )

    [6] => Array
        (
            [0] => 28
        )

)

And I'm trying to delete element by value using my function:

function removeElementWithValue($obj, $delete_value){

    if (!empty($obj->field)) {
         foreach($obj->field as $key =>$value){
            if (!empty($value)) {
                foreach($value as $k=>$v){
                    if($v == $delete_value){
                       $obj->field[$key][$k] = '';
                    }
                }
            }
         }
    }
    return urldecode(http_build_query($obj->field));
}

echo removeElementWithValue($request, '19');

After operation above I have: 5[0]=&5[1]=18&6[0]=28; // Right!!!

echo removeElementWithValue($request, '18');

After operation above I have: 5[0]=&5[1]=&6[0]=28; // Wrong ???

But my expected result after second operation is:

5[0]=19&5[1]=&6[0]=28;

Where is my mistake? Thanks!

your function is for StdClass Objects and you are passing array. why ? — Viral
– Viral, Commented Jun 10, 2015 at 9:17
That's apparently not possible, as once you have deleted the value you, you cannot regain it. The alternative is make a copy of your original array to some other variable. now, apply your operations on the new copied variable. — Ashwani Goyal
– Ashwani Goyal, Commented Jun 10, 2015 at 9:34

splash58 · Accepted Answer · 2015-06-10 09:36:34Z

1

Use array_walk_recursive to find and change value

$arr = Array (
    5 => Array ( 0 => 19, 1 => 18 ),
    6 => Array ( 0 => 28));

$value = 18;

array_walk_recursive($arr, 
      function (&$item, $key, $v) { if ($item == $v) $item = ''; }, $value);

print_r($arr);

result:

Array (
    5 => Array ( 0 => 19, 1 =>  ),
    6 => Array ( 0 => 28));

answered Jun 10, 2015 at 9:36

splash58

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Mike Miller · Accepted Answer · 2015-06-10 09:38:38Z

0

A simpler function might be..

function removeElementWithValue($ar,$val){

    foreach($ar as $k=>$array){
        //update the original value with a new array
        $new_ar = array_diff_key($array,array_flip(array_keys($array,$val)));
        if($new_ar){
            $ar[$k]=$new_ar;
        }else{
            unset($ar[$k]);//or remove the empty value
        }
    }

    return $ar;
}

answered Jun 10, 2015 at 9:38

Mike Miller

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