PHP阵列按数据库的评分结果排序

Question

I have an array that I'm simply trying to order by a score key that contains the value that I'm trying to sort by. The desired results would change the order of the array below to display the index in the following order: [0] , [2] , [1] .

I'm looping through the results which are pulled from a database. I'm creating a key named score and then pushing the $row2 array in to a separate array because if I use mysql_data_seek it gets rid of the score key.

Also it's creating an unwanted key score at the bottom.

How can I best clean this up and make sure the results are ordered high to low as desired?

$my_array = array();

while ($row2 = mysql_fetch_assoc($result2))
{
 //score determined here
 //$row2['score'] = ...more math, variable is numeric, not a string
 array_push($array_page,$row2);
}

Current undesired results...

Array
(
    [0] => Array
        (
            [score] => 7
        )
    [1] => Array
        (
            [score] => 2
        )
    [2] => Array
        (
            [score] => 4
        )
    [score] => 
)

Desired results...

Array
(
    [0] => Array
        (
            [score] => 7
        )
    [2] => Array
        (
            [score] => 4
        )
    [1] => Array
        (
            [score] => 2
        )
)

Answer 1

function scoreSort($a, $b){
  if($a['score'] == $b['score']) return 0;
  return $a['score'] > $b['score'] ? -1 : 1;
}
usort(&$myArray, 'scoreSort');

on php>5.3 you can use inline-functoins:

usort(&$myArray, function($a,$b){ /* ... */ });