PHP最大函数用键作为php函数

Question

我在php中有一个函数：

function cmp_key($lst){
    $itersect_size = count(array_intersect($zset, $lst)); //zset is a list which i have
    return $intersect_size,-count($lst)
}

然后在python中使用此代码：

list_with_biggest_intersection = max(iterable,key = cmp_key)

如果我想使用php函数cmp_key作为max函数的关键字，我怎样才能在php中执行上面的代码行...

Answer 1

调用函数将返回值作为max函数的参数传递。

list_with_biggest_intersection = max(iterable, cmp_key($lst));

Answer 2

在Python中复制@ mgilson的答案，这是PHP中的等价物。

function cmp_key($set, $list) {
  return count(array_intersect($set, $list));
}

// This iterates over all lists and compares them with some
// original list, here named $set for consistency with the other example.
$largest = NULL;
foreach ($lists as $list) {
  if (!isset($largest)) {
    $largest = array('list' => $list, 'count' => cmp_key($set, $list));
  }
  else {
    $count = cmp_key($set, $list);
    if ($count > $largest['count']) {
      $largest = array('list' => $list, 'count' => $count);
    }
  }
}
$list_with_biggest_intersection = $largest['list'];