Sorting Array by Key (Key is a string)

Question

I have a simple Array. The goal is, to sort them ascending by the key.

$someUnsortedArray = array("140/142" => "FirstValue", "118/120" => "SecondValue", "122/124" => "ThirdValue", "40/42" => "FourthValue");

ksort($someUnsortedArray);

My Output:

array (size=4)  
  '118/120' => string 'SecondValue' 
  '122/124' => string 'ThirdValue'  
  '140/142' => string 'FirstValue'   
  '40/42' => string 'FourthValue'

Expected Output:

array (size=4)  
'40/42' => string 'FourthValue'  
'118/120' => string 'SecondValue'   
'122/124' => string 'ThirdValue'  
'140/142' => string 'FirstValue'

What's the function in php I am searching for?

Kevin · Accepted Answer · 2014-10-31 13:16:08Z

6

You could use uksort() in this case:

$someUnsortedArray = array("140/142" => "FirstValue", "118/120" => "SecondValue", "122/124" => "ThirdValue", "40/42" => "FourthValue");

uksort($someUnsortedArray, function($a, $b){
    $a = str_replace('/', '', $a);
    $b = str_replace('/', '', $b);
    return $a - $b;
});

echo '<pre>';
print_r($someUnsortedArray);

answered Oct 31, 2014 at 13:16

Kevin

41.9k12 gold badges57 silver badges72 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Tyralcori Over a year ago

In the theory it would work.. But is there any solution without replacing the "/" without nothing?

Kevin Over a year ago

@Tyralcori you need to sort it in custom since you won't get the desired values if they are going to be compared as strings

Kevin Over a year ago

@Tyralcori if you do not want a replace you could explode it

Tyralcori Over a year ago

At least, that's my solution. Thank you very much.

Kevin Over a year ago

@Tyralcori glad this helped by the way, barry's answer is much good, you could also pick that one

Barry · Accepted Answer · 2014-10-31 13:22:40Z

2

As an alternative, you can also make use of the natural order string compare function to compare the keys

function sortKey($a, $b) {
    return strnatcmp($a, $b);
}

uksort($someUnsortedArray,"sortKey");

answered Oct 31, 2014 at 13:22

Barry

3,7331 gold badge20 silver badges25 bronze badges

Comments

Kevin · Accepted Answer · 2014-10-31 15:27:27Z

2

Checking php manual:

http://php.net/manual/en/function.ksort.php

Use ksort() with SORT_NUMERIC flag.

$someUnsortedArray = array("140/142" => "FirstValue", "118/120" => "SecondValue", "122/124" => "ThirdValue", "40/42" => "FourthValue");
ksort($someUnsortedArray, SORT_NUMERIC);

echo '<pre>';
print_r($someUnsortedArray);

Sample Output

edited Oct 31, 2014 at 15:27

Kevin

41.9k12 gold badges57 silver badges72 bronze badges

answered Oct 31, 2014 at 13:16

Alex Palombo

1451 gold badge2 silver badges8 bronze badges

4 Comments

Alex Palombo Over a year ago

what about SORT_NUMERIC

Veve Over a year ago

"40/42" or "118/120" aren't numeric values, they are string.

Veve Over a year ago

My bad, it works indeed. If you edit your answer I'll cancel my downvote. (Can't now)

Kevin Over a year ago

Sidenote: As you can see this answer has a negative score, but don't downvote this answer anymore as this is already correct. +1

0xGiddi · Accepted Answer · 2014-10-31 13:17:28Z

0

Use the function uksort and pass the function a custom function/method that will do the right conversion based on your needs.

Here is the PHP manual page for he function uksort http://php.net/manual/en/function.uksort.php

answered Oct 31, 2014 at 13:17

0xGiddi

6144 silver badges12 bronze badges

Comments

evilive · Accepted Answer · 2014-10-31 13:21:41Z

0

The result is the expected behaviour, because if you sort Strings in alphanumerical order 1* is always before 4*.

If you want to have it sorted by number you'll have to split your string, convert the elements to number and sort them by number.

Implementation depends on what you want to achieve. Just a list of the Keys? Then you could iterate in an foreach loop adressing the keys for example.

There won't be an "out-of-the-box" PHP Function.

answered Oct 31, 2014 at 13:21

evilive

9961 gold badge8 silver badges27 bronze badges

Comments

Halayem Anis · Accepted Answer · 2014-10-31 13:29:09Z

0

$someUnsortedArray = array("5/142" => "FirstValue", "118/120" => "SecondValue", "122/124" => "ThirdValue", "40/42" => "FourthValue");

uksort($someUnsortedArray, function($a, $b) {
    // to avoid manipulating them as a string ....      
    return ((float)$a)-((float)$b);
});
var_dump($someUnsortedArray);

answered Oct 31, 2014 at 13:29

Halayem Anis

7,8052 gold badges28 silver badges45 bronze badges

Collectives™ on Stack Overflow

Sorting Array by Key (Key is a string)

6 Answers 6

5 Comments

Comments

4 Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

6 Answers 6

5 Comments

Comments

4 Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related