如何检查特定的值索引是否存在

I have a php array like this.

Array
(
    [first_year] => Array
        (
            [1] => Array
                (
                    [0] => Array
                        (
                            [distiction] =>  , 2, 3, 4, 5, 6,  , 8, 9
                            [name] => ‌Mark
                            [status] => Pass with credit
                        )

                )

            [2] => Array
                (
                    [0] => Array
                        (
                            [distiction] =>  , 2, 3, 4, 5, 6, 7,  , 9
                            [name] => ‌John
                            [status] => 
                        )

                )

        )
)

I got that data by print_r($dataArray[$academic_year][$major]). How can I check if $dataArray[$academic_year][$major][$year] and check if [first_year] has values or not? I have already tried out empty(), !array_filter() and $dataArray[$academic_year][$major][$year] == []. But none of it working for me. Thank you.

You can use:

if (array_key_exists($year, $dataArray[$academic_year][$major])) {
    if ($dataArray[$academic_year][$major][$year]){
        //your code here
    }
}

Try This one:

If $dataArray[$academic_year][$major][$year] return array then

if ( isset( $dataArray[$academic_year][$major][$year] ) &&  count($dataArray[$academic_year][$major][$year])) {
    //your code here
}

What about coalesce operator?

Just return default behavior when it does not exist:

$data = $dataArray[$academic_year][$major][$year] 
        ?? ['distiction' => '', 'name' => '', 'status' => ''];

or

$data = $dataArray[$academic_year][$major][$year] ?? null;
if (is_array($data) && !empty($data)) {
  // Your code...
}