使用PHP按值从多维索引数组中删除元素 - Remove element from multidimensional indexed array by value using PHP

Remove element from multidimensional indexed array by value using PHP

我有一个数组:

Array
(
    [5] => Array
        (
            [0] => 19
            [1] => 18
        )
    [6] => Array
        (
            [0] => 28
        )
)

和我试图删除元素的值使用我的函数:

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');

术后上面我有: 5 [0] =, 5 [1] = 18, 6 [0] = 28; //右! !

echo removeElementWithValue($request, '18');

术后上面我有: 5 [0] =, 5 [1] =, 6 [0] = 28; //错了吗? ?

但第二次操作后的预期结果是:

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

我错在哪里?谢谢!

使用array_walk_recursive查找和修改值

$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);

结果:

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

更简单的函数可能是…

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;
}