如果内部数组中存在匹配，则获取外部数组的索引

Question

当我print_r我的数组给出

时

Array ( 
   [0] => Array ( [userid] => 2 [popularity] => 41.7 ) 
   [1] => Array ( [userid] => 5 [popularity] => 33.3 ) 
   [2] => Array ( [userid] => 7 [popularity] => 25.0 ) 
)

是在查询用户并按流行度desc排序后返回的数组，意思是
具有id 2 has popularity 41.7的用户，具有id 5 has popularity 33.3的用户等等，

然后我有一个动态查询，向每个用户展示他的受欢迎程度 例如：
user with id 2 has popularity of 41.7
                user with id 5 has popularity of 33.3等

我想要的是显示每个用户的位置（外部数组index）如果动态查询的用户ID与上面的数组的输出匹配然后递增1，因为数组索引始终开始0 示例：
user with id 2, will have position of 1 (the winner)
user with id 5, will have position of 2         
user with id 7, will have position of 3等。

我该怎么做......

Answer 1

此代码修改数组和广告新键'position'（= $ key + 1）到每个元素。

function addPosition(&$item, $key) {
    $item['position'] = $key + 1;
}
array_walk($data, 'addPosition');