Php相当于这个功能

Question

I have this javascript function, I need to convert this to a php function

function vwap(p)
{
  if (p.length === 1 && Array.isArray(p[0])) p = p[0]
  if (!p.length) return 0
  // formula: sum(num shares * share price)/(total shares)
  return p.reduce((s,x) => s + (x[0]*x[1]), 0) / p.reduce((s,x) => s + x[0], 0) || 0;
}

I tried below so far but I am struck

function vwap($p) {
    if (empty($p)) {
        return 0;

        for ($p as $s) {
            //unable to understand this part in js
        }

    }

}

For testing purpose vwap([[5, 10], [13, 8.5], [10, 11]]) must return 9.66

Answer 1

    function vwap($p)
    {
        if (count($p) === 1 && is_array($p[0])) {
            $p = $p[0];
        }

        if (!count($p)) {
            return 0;
        }

        return array_reduce($p, function ($s, $x) {
                return $s + ($x[0] * $x[1]);
            }, 0) / array_reduce($p, function ($s, $x) {
                return $s + $x[0];
            }, 0);
    }

1:1 php port.