How to get array combinations in php?

Question

I have a array in php

array(100,125,135);

I would like to know How I can get all combinations like in the below EG ?

Eg:100=>125,100=>135,125=>100,125=>135,135=>100,135=>125

I Tried something like this

$selected_items = array(100,125,135);
$total = count($selected_items);
$combination = array();
$newcom=0;
    for($i=0;$i<$total;$i++){           
        if($newcom <= $total-1) $newcom = $newcom-1;
        echo  $newcom."-----";
         $combination[$i] = array($selected_items[$i]=> $selected_items[$newcom]);
            $newcom = $i+1;  
    }

But this is not working to get all combinations

Please help me.

Hint: You need two loops.

Re Captcha
– Re Captcha

2014-07-07 11:35:36 +00:00
Commented Jul 7, 2014 at 11:35 — Re Captcha
– Re Captcha, Commented Jul 7, 2014 at 11:35
en.wikipedia.org/wiki/…

in need of help
– in need of help

2014-07-07 11:36:26 +00:00
Commented Jul 7, 2014 at 11:36 — in need of help
– in need of help, Commented Jul 7, 2014 at 11:36

slash197 · Accepted Answer · 2014-07-07 11:38:13Z

3

Try this

$temp = array(1, 2, 3);
$result = array();

foreach ($temp as $value)
{
    foreach ($temp as $value2)
    {
       if ($value != $value2) $result[$value] = $value2;
    }
}

answered Jul 7, 2014 at 11:38

slash197

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2 Comments

App tester Over a year ago

But this is showing only Array ( [1] => 3 [2] => 3 [3] => 2 )

App tester Over a year ago

I can't see combination of 1,2

bhushya · Accepted Answer · 2014-07-07 12:12:36Z

3

$a = array(100,125,135);
$output = array();
foreach ($a as  $first) {
    $arr[$first]=array();
    foreach ($a as $second) {
        if($first != $second)
            $arr[$first][] = $second;
    }

}
$output = $arr;
print_r($output);

edited Jul 7, 2014 at 12:12

answered Jul 7, 2014 at 11:40

bhushya

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4 Comments

default locale Over a year ago

That's not a problem. You can always delete your answer here.

bhushya Over a year ago

@defaultlocale check above one is not correct .. hahha which has 2 votes

bhushya Over a year ago

@Apptester Array ( [100] => Array ( [0] => 125 [1] => 135 ) [125] => Array ( [0] => 100 [1] => 135 ) [135] => Array ( [0] => 100 [1] => 125 ) )

default locale Over a year ago

my bad, sorry. Didn't realize that your answer was different. +1 :)

Pardon Me · Accepted Answer · 2014-07-07 11:58:47Z

1

You could use a couple of foreach loops -

$sequence     = [100, 125, 135];
$permutations = [];

foreach ($sequence as $value) {
    foreach ($sequence as $value2) {
        if ($value != $value2) {
            $permutations[] = [$value => $value2];
        }
    }
}

answered Jul 7, 2014 at 11:58

Pardon Me

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Comments

YANTHO · Accepted Answer · 2014-07-07 11:58:19Z

0

I don't think this can be done. An array contains a key and a value. In your example you want an array where the keys can be the same. You will just overwrite your values So if you run your example the result will be somthing like the following:

 100=>135
,125=>135
,135=>125

A possible solution can be multidimensional arrays:

 100=>array(125, 135)
,125=>array(100, 135)
,135=>array(100, 125)

answered Jul 7, 2014 at 11:58

YANTHO

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