$num1 = array(3, 5, 4, 3);
$num2 = array(27, 50, 44, 78);
array_multisort($num1, SORT_ASC, $num2, SORT_DESC);

print_r($num1);
print_r($num2);
//result: Array ( [0] => 3 [1] => 3 [2] => 4 [3] => 5 ) Array ( [0] => 78 [1] => 27 [2] => 44 [3] => 50 )

$arr = array(
    '0' => array(
        'num1' => 3,
        'num2' => 27 
    ),
    
    '1' => array(
        'num1' => 5,
        'num2' => 50
    ),
    
    '2' => array(
        'num1' => 4,
        'num2' => 44
    ),
    
    '3' => array(
        'num1' => 3,
        'num2' => 78
    ) 
);

foreach ( $arr as $key => $row ){
    $num1[$key] = $row ['num1'];
    $num2[$key] = $row ['num2'];
}

array_multisort($num1, SORT_ASC, $num2, SORT_DESC, $arr);

print_r($arr);
//result:Array([0]=>Array([num1]=>3 [num2]=>78) [1]=>Array([num1]=>3 [num2]=>27) [2]=>Array([num1]=>4 [num2]=>44) [3]=>Array([num1]=>5 [num2]=>50))