Array pretty printer for PHP

ats.php

<?php

function arrToStr(array $a)
{
    if (empty($a)) return '[]';
    
    foreach($a as $k => $v)
    {
        if (is_array($v))
            $a[$k] = arrToStr($v);
    }
    
    $elems = implode(', ', $a);
    
    return '['.$elems.']';
}


$a = [1,2,[3,[],[[]],4]];

echo arrToStr($a); # output: [1, 2, [3, [], [[]], 4]]