在关联数组中查找最大值

Question

I have a associative array:

$users[0] = array('name' => 'Jim', 'depth' => '1', 'bk_id' => '9'); 
$users[1] = array('name' => 'Jill', 'depth' => '3', 'bk_id' => '10'); 
$users[2] = array('name' => 'Jack', 'depth' => '7', 'bk_id' => '17'); 

I would like to know a way of finding the array index with the maximum or greatest depth value?

Any suggestion is most appreciated.

Answer 1

Just iterate and look at the maximum value:

var max = 0, maxIndex = -1;
for(var i=0;i<users.length;i++) {
   if(parseInt(users[i].depth,10) > max) {
      max = users[i].depth;
      maxIndex = i;
   }
}
console.log("Your maximum depth is %d at index %d", max, maxIndex);