PHP - 排序多维数组

Question

i'm Fabio Masino and i'm italian, so my English may be not perfect.

I would like to realize a method for sorting football groups

• by points (sorted as numbers, in descending order),
• then by goals scored (sorted as numbers, in descending order),
• then by name (sorted as strings in ascending order).

For example, if i have this multi-dimensional array:

$group=array(
       array("Juve", 15, 45), // the values are name, points and goals scored
       array("Inter", 21, 40),
       array("Milan", 15, 50)
      );

I would like to have this result:

 $group=array(
           array("Inter", 21, 40),
           array("Milan", 15, 50),
           array("Juve", 15, 45)
          );

Thank you in advance and best regards.

Answer 1

Points is the second element of each subarray, right? If so, then do this

function CustomSort($a, $b)
{
    return $a[1] < $b[1] ? -1 : 1;
}

usort($group, 'CustomSort');

If you want to focus on other criteria like names and goals, then just change the numeric array index to the number that represents each criteria in each subarray. For example, sorting names would just be

function NameSort($a, $b)
{
    return $a[0] > $b[0] ? -1 : 1;
}