Sort array using multiple criteria in PHP [duplicate] - php

Question

This question already has answers here:
How can I sort arrays and data in PHP?
(14 answers)
Closed 8 years ago.
I know there are some other topics about sorting with multiple criteria, but they don't fix my problem.
Let's say I have this array:
Array
(
[0] => Array
(
[uid] => 1
[score] => 9
[endgame] => 2
)
[1] => Array
(
[uid] => 2
[score] => 4
[endgame] => 1
)
[2] => Array
(
[uid] => 3
[score] => 4
[endgame] => 100
)
[3] => Array
(
[uid] => 4
[score] => 4
[endgame] => 70
)
)
I want to sort it, putting the one with the HIGHEST score on top. On same score, I want the one with the LOWEST endgame number on top.
The sorting mechanisme should rank user1 on top, then user2, then 4 and then user3.
I use this sorting mechanisme:
function order_by_score_endgame($a, $b)
{
if ($a['score'] == $b['score'])
{
// score is the same, sort by endgame
if ($a['endgame'] == $b['endgame']) return 0;
return $a['endgame'] == 'y' ? -1 : 1;
}
// sort the higher score first:
return $a['score'] < $b['score'] ? 1 : -1;
}
usort($dummy, "order_by_score_endgame");
This gives me the following array:
Array
(
[0] => Array
(
[uid] => 1
[score] => 9
[endgame] => 2
)
[1] => Array
(
[uid] => 3
[score] => 4
[endgame] => 100
)
[2] => Array
(
[uid] => 2
[score] => 4
[endgame] => 1
)
[3] => Array
(
[uid] => 4
[score] => 4
[endgame] => 70
)
)
As you can see, the array isn't sorted properly... Anyone knows what I'm doing wrong? Thanks a lot!

Answer 1

Your function should be like this:
function order_by_score_endgame($a, $b) {
if ($a['score'] == $b['score']) {
// score is the same, sort by endgame
if ($a['endgame'] > $b['endgame']) {
return 1;
}
}
// sort the higher score first:
return $a['score'] < $b['score'] ? 1 : -1;
}
Try it out. It will give you result like this:
Array
(
[0] => Array
(
[uid] => 1
[score] => 9
[endgame] => 2
)
[1] => Array
(
[uid] => 2
[score] => 4
[endgame] => 1
)
[2] => Array
(
[uid] => 4
[score] => 4
[endgame] => 70
)
[3] => Array
(
[uid] => 3
[score] => 4
[endgame] => 100
)
)