PHP: sort array ouput but randomize same values

Question

Whats the best/easiest way to get this:

what i have:

array('100', '100', '100', '80', '70', '70', '50', '45');

what the output should look like:

100 (random order)
100 (random order)
100 (random order)
80
70 (random order)
70 (random order)
50
45

the values also include data like a name and image and this people should be randomized by its value and DESC order if they dont have the same value — ggzone
– ggzone, Commented Jul 18, 2012 at 9:28
Does it matter which 70 comes first if they are the same value? — Fluffeh
– Fluffeh, Commented Jul 18, 2012 at 9:32
as its a ranking system and they have the same value noone of them should be favored — ggzone
– ggzone, Commented Jul 18, 2012 at 9:35

Baptiste Placé · Accepted Answer · 2012-07-18 16:52:29Z

4

you have to use usort or uasort (uasort keeps keys of the array). Using PHP 5.3, you may do it like this :

shuffle($array); // randomize

uasort($array, function($a, $b){
    if($a === $b) {
        return rand(0, 1);
    }
    return $a < $b;
});

You may have to name the function before, like the php documentation shows http://www.php.net/manual/fr/function.uasort.php

edited Jul 18, 2012 at 16:52

answered Jul 18, 2012 at 9:52

Baptiste Placé

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3 Comments

ggzone Over a year ago

this sound good... i tried it but the output is not as i excepted: theres no random right now and the sorting is like: 100,100,45,70,70

Baptiste Placé Over a year ago

Yeah you need a shuffle() on the array before using uasort, forgot it sorry :)

mabe.berlin Over a year ago

One user defined sort function is enough but you have to return -1, 0 or 1 instead of 0 or 1 for the same and a boolean for differnt!. Try this:

usort($this->_ads, function ($a, $d) {                 if ($a == $b) {                     return mt_rand(0, 2) - 1;                 }                 return ($a > $b) ? -1 : 1;             });

Luke Mills · Accepted Answer · 2012-07-18 09:46:37Z

0

You can use usort (http://www.php.net/manual/en/function.usort.php) or uksort depending on your requirements. You can then choose to randomly return a positive or negative number if the values are equal.

answered Jul 18, 2012 at 9:46

Luke Mills

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