Ordering an array by specific value

Question

I have original array like this:

$arr=array(10,8,13,8,5,10,10,12);

and want to sort so finally become:

$arr=array(10,10,10,8,8,13,12,5);

To get final result i using this way:

$arr=array(10,8,13,8,5,10,10,12);

// Remove array that contain array(1)
$arr_diff=array_diff(array_count_values($arr), array(1));

// Remove array that contain keys of $arr_diff
$arr=array_diff($arr, array_keys($arr_diff));

// Sort
rsort($arr);
ksort($arr_diff);

// unshift
foreach ($arr_diff as $k=>$v)
{
    while ($v > 0)
    {
        array_unshift($arr,$k);
        $v--;
    }
}
// print_r($arr);

My question is there an another more simple way?

Thanks.

What's the logic for that order? Number of occurrences?

deceze
– deceze ♦

2013-07-24 06:31:49 +00:00
Commented Jul 24, 2013 at 6:31 — deceze
– deceze ♦, Commented Jul 24, 2013 at 6:31
Looks like dups -> no dups then high -> low..

elclanrs
– elclanrs

2013-07-24 06:33:24 +00:00
Commented Jul 24, 2013 at 6:33 — elclanrs
– elclanrs, Commented Jul 24, 2013 at 6:33

Community · Accepted Answer · 2017-05-23 12:13:00Z

3

$occurrences = array_count_values($arr);
usort($arr, function ($a, $b) use ($occurrences) {
    // if the occurrence is equal (== 0), return value difference instead
    return ($occurrences[$b] - $occurrences[$a]) ?: ($b - $a);
});

See Reference: all basic ways to sort arrays and data in PHP.

edited May 23, 2017 at 12:13

CommunityBot

11 silver badge

answered Jul 24, 2013 at 6:34

deceze♦

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5 Comments

deceze Over a year ago

Note: you may have to reverse $a and $b, depending on whether you want it ascending or descending. I always get confused with what the result will be...

deceze Over a year ago

Yeah, there was a typo. Already fixed. You should have seen it yourself.

Idham Perdameian Over a year ago

Notice has gone, but final result not print_r(array(10,10,10,8,8,13,12,5)); $arr=array(10,8,13,8,5,10,10,12); $occurrences = array_count_values($arr); usort($arr, function ($a, $b) use ($occurrences) { // if the occurrence is equal (== 0), return value difference instead return ($occurrences[$a] - $occurrences[$b]) ?: ($a - $b); }); krsort($arr); print_r($arr); I need krsort() to get print_r(array(10,10,10,8,8,13,12,5));

deceze Over a year ago

As I said, you have to reverse $a and $b to switch ascending/descending order.

Idham Perdameian Over a year ago

Thanks, you are great. Just: return ( $occurrences[$b] - $occurrences[$a]) ?: ($b - $a);. Finally solved.

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