PHP : Sort 2 dimension Array

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"
  }

What's your criteria for the best 5 person ?

AyB
– AyB

2014-01-29 06:42:57 +00:00
Commented Jan 29, 2014 at 6:42 — AyB
– AyB, Commented Jan 29, 2014 at 6:42
Duplicate: stackoverflow.com/questions/2699086/…

xtraorange
– xtraorange

2014-01-29 06:44:18 +00:00
Commented Jan 29, 2014 at 6:44 — xtraorange
– xtraorange, Commented Jan 29, 2014 at 6:44
The best five time @user007

alexandcote
– alexandcote

2014-01-29 06:51:28 +00:00
Commented Jan 29, 2014 at 6:51 — alexandcote
– alexandcote, Commented Jan 29, 2014 at 6:51

Jasper · Accepted Answer · 2014-01-29 06:43:22Z

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");
?>

answered Jan 29, 2014 at 6:43

Jasper

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2 Comments

alexandcote Over a year ago

I don't find how I can do my sort with this type of sort. I'm not a master in sorting. Can you gave me a short example of how your start would ? So I repeat the goal, sort the times ascending for find the best 5 persons. The best five persons will be the persons they have the five best times so on the top. @Jasper

Jasper Over a year ago

@Alexandcote The way usort works is: a reference to a function is passed in along with your array. The usort function then runs the function for every index in your array. When you return -1 then the $a index is moved to a lower index and when you return 1 then the $a index is moved to a higher index. When you return 0 nothing is changed. In the above example strcmp is used to determine which way the index should be moved. Note that $a and $b are two indexes of the array. E.g. if ($a['time'] < $b['time']) {return -1} else if ($a['time'] > $b['time']) {return 1}return 0;

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