PHP - Sorting an array of objects by object property [duplicate]

Question

I trust you are well.

I would like to try and sort this array by the score property of the object. Below is an example of the data (print_r).

Array
(
    [0] => stdClass Object
        (
            [device] => 352454530452548
            [reg] => MAM 432A
            [distance] => 823.36
            [ha_points] => 1
            [hb_points] => 235
            [hc_points] => 7.5
            [idling_points] => 111.5
            [speeding_points] => 168
            [total] => 523
            [score] => 68.239895064127
        )

    [1] => stdClass Object
        (
            [device] => 3518020541565265
            [reg] => SM** ***
            [distance] => 851.07
            [ha_points] => 14
            [hb_points] => 136
            [hc_points] => 6
            [idling_points] => 50
            [speeding_points] => 336
            [total] => 542
            [score] => 68.957730856451
        )

The score can be anything from 0 to 100 and I would like to sort them into descending order (biggest first?). To make things more complicated, although the chances are very slim it is possible to have two identical scores in which case it doesn't matter which one is first.

Any ideas?

Thanks in advance,

Paul

Vlad Preda · Accepted Answer · 2014-07-25 13:10:52Z

4

A simple usort will do the job.

$arrData = array(/* ... */);
usort($arrData, function($a, $b) {
    return $a->score < $b->score ? 1 : -1;
});

edited Jul 25, 2014 at 13:10

answered Jul 25, 2014 at 13:06

Vlad Preda

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4 Comments

deceze Over a year ago

You need to return an integer < 1, 0 or > 1, not a boolean!

Smithey93 Over a year ago

Brilliant, that worked although I had to change the return to $a->score < $b->score as it was ascending order. Much appreciated cheers!

Vlad Preda Over a year ago

@deceze: Thanks, forgot about that. Whoever added the - - it won't work properly, since these are floats, and the difference will be rounded.

deceze Over a year ago

True about the floats. You should still return three possible return states, not just 2!

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