PHP：排序二维数组

Question

I'm trying to sort a two dimensions array, and I have no idea where to start. I looked at array_multisort, but I don't really found a good solution with this sorting.

I need to sort by time, each time are associate with a race. I need to find who are the best 5 person so the best time.

My array looks like this:

 [0]=>
  array(2) {
    [0]=>
    string(15) "Beaumier Mélina"
    [1]=>
    string(7) "1:29.30"
  }
  [1]=>
  array(2) {
    [0]=>
    string(14) "Frizzle Émilie"
    [2]=>
    string(7) "1:47.96"
  }
  [2]=>
  array(3) {
    [0]=>
    string(18) "Morissette Camélia"
    [2]=>
    string(7) "1:50.26"
    [1]=>
    string(7) "1:50.97"
  }

Answer 1

You can use usort . You give it a callback function and compare each index of the array. Since you make the callback function you can compare by the time for each index in the array.

http://php.net/usort

From the above documentation:

<?php
function cmp($a, $b)
{
    return strcmp($a["fruit"], $b["fruit"]);
}

$fruits[0]["fruit"] = "lemons";
$fruits[1]["fruit"] = "apples";
$fruits[2]["fruit"] = "grapes";

usort($fruits, "cmp");
?>