确定数组中的空值并获取键数组

Question

I had some problem when to post array data:

When I post the data it will be 2 array:

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

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

Note that Array2 will be some blank data.

Now I am working until using array_filter(Array2) but the question is can i get the key /data from Array1 match to the not null data from Array2?

Maybe it will be some confusing on question, Sorry to my bad language...

Answer 1

If you want to filter $array1 based on the value of $array2, you can use filter with third parameter ARRAY_FILTER_USE_KEY to use the key.

$array1 = [1,2,3];
$array2 = [1,null,500];

$newArray1 = array_filter($array1, function ($key) use ($array2) {
        return $array2[$key];
    },ARRAY_FILTER_USE_KEY
);

$newArray2 = array_filter($array2);

echo "<pre>";
print_r( $newArray1 );
print_r( $newArray2 );
echo "</pre>";

This will result as:

Array
(
    [0] => 1
    [2] => 3
)
Array
(
    [0] => 1
    [2] => 500
)