PHP recursion print all elements of a multidimensional array with keys

Question

I found the following code, which prints all the elements of an array fine. How can I modify it to print a key one time and then all the values corresponding to the key, the

Answer 1

function printAll($a) {
    if (!is_array($a)) {
        echo $a, ' ';
        return;
    }

    foreach($a as $k => $value) {
         if($k<10){
             printAll($k);
             printAll($value);
        }
    }
}