Ordering an array of objects by object value in PHP

Question

If I have an array with objects like this:

Array
(
    [0] => stdClass Object
        (
            [img] => image1.jpg
            [order] => 1
        )

    [1] => stdClass Object
        (
            [img] => image2.jpg
            [order] => 3
        )

    [2] => stdClass Object
        (
            [img] => image3.jpg
            [order] => 2
        )

    [3] => stdClass Object
        (
            [img] => image4.jpg
            [order] => 4
        )
)

How can I then sort the array by the objects "order" value? In this case the order should be: image1.jpg, image3.jpg, image2.jpg, image4.jpg.

You're looking for [`usort()`](http://php.net/usort). – Ja͢ck Jun 05 '13 at 15:31 — Ja͢ck, Jun 05 '13 at 15:31

Sidux · Answer 1 · 2013-06-05T16:01:24.953

1

Here is an exemple for your code :

function sortImage($a, $b)
{
    if ($a->img == $b->img) {
        return 0;
    }
    return ($a->img < $b->img) ? -1 : 1;
}


usort($youArray, "sortImage");

edit: in your case you have order property but php can also compare "image1" and "image2" strings

edited Jun 05 '13 at 16:01

answered Jun 05 '13 at 15:41

Sidux

557
1
5
15

score 0 · Answer 2 · answered Jun 05 '13 at 15:34

0

You should use this function: http://php.net/manual/en/function.usort.php

You have to write a comparison function, to be used as the second argument to usort.

answered Jun 05 '13 at 15:34

ElmoVanKielmo

10,907
2
32
46

score 0 · Accepted Answer · answered Jun 05 '13 at 15:41

0

PHP 5.3+

usort($myArray, function ($a, $b) {
    if ($a->order == $b->order) {
        return 0;
    }
    return ($a->order < $b->order) ? -1 : 1;
});

For < PHP 5.3 just change the anonymous function for a predefined named function.

answered Jun 05 '13 at 15:41

MrCode

63,975
10
90
112

Ordering an array of objects by object value in PHP

3 Answers3