Values use once in an array from JSON

Question

I have a Json array the following values:

[small, medium, small, large, medium, medium, large, small]

And I would like to get this array only:

[small, medium, large]

Well, each values use only once in the second array from the first one.

        foreach($json_array as $json_arr){ 
            if (!isset($size_array)) {
                $size_array = array();
            }   

            foreach($size_array as $s_a) {
                if ($s_a != $json_arr['size']) {
                    $x = true;
                } 
            }

            $size_array[] = $json_arr['size'];

        }               

        echo "<br><br><br>";
        foreach($size_array as $s_a) {
            echo $s_a;
        }


[{"size":"small"},{"size":"small"},{"size":"medium"},{"size":"medium"},{"size":"large"},{"size":"small"},{"size":"large"},{"size":"large"},{"size":"large"}]

[Search result][1] :-) .... Follow the Link it is explaniere well [1]: http://stackoverflow.com/questions/4833651/javascript-array-sort-and-unique — , Jul 06 '15 at 19:47
array_unique is interesting, but not working... json structure e.g. [size: small, size: medium] — Atti, Jul 06 '15 at 19:50
if `[size: small, size: medium]` then `array_unique` must work. but result will be `[small, medium]` - ie with numerous keys — splash58, Jul 06 '15 at 19:53

Alive to die - Anant · Accepted Answer · 2015-07-06T20:31:38.373

1

Your given json format is not correct. I created an example for your better understanding :-

<?php 
$json = '{"0":"small","1":"medium","2":"small","3":"large","4":"medium","5":"medium","6":"large","7":"small"}';
$new_array = json_decode($json);
$common_array = array();
foreach($new_array as $new_arr){
    $common_array[] = $new_arr;
}
echo "<pre/>";print_r($common_array);
echo "<pre/>";print_r(array_unique($common_array));
?>

Output:-https://eval.in/393669

Note:- I have taken your json format. modified it to be correct and make example for that. It will be easy to understand i hope. thanks.

Based on your latest json format edit, here the link, which ave proper answer for that:-

https://eval.in/393680

edited Jul 06 '15 at 20:31

answered Jul 06 '15 at 20:00

Alive to die - Anant

70,531
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it seems good but JSON contains other attributums, I only want to use the 'size' from Json – Atti Jul 06 '15 at 20:15
Great to hear that. thanks @Atti. glad to help you. Cheers.:):) – Alive to die - Anant Jul 06 '15 at 20:27
I added a second answer also by editing my answer.If you need you can check that also.thanks. – Alive to die - Anant Jul 06 '15 at 20:32

score 0 · Answer 2 · answered Jul 06 '15 at 19:56

You can combine array_column to extract the value of size, then run array_unique on it.

$size_array = array_unique(array_column($json_array, "size"));

If you want you can then get the original array with all keys but with just the unique sizes.

$uniques = array_intersect_key($json_array, $size_array);

splash58 · Answer 3 · 2015-07-06T20:13:15.407

if your version of php does not have function array_column

$str = '[{"size":"small"},{"size":"small"},{"size":"medium"},{"size":"medium"},{"size":"large"},{"size":"small"},{"size":"large"},{"size":"large"},{"size":"large"}]';

$json_array = json_decode($str, true);
$ss = array();   // list of sizes. Realy it is the result too 
                 // but array has structure  as [ smal, medium, large ]
$new = array_filter($json_array, 
              function ($item) use (&$ss) {
                 if (in_array($item['size'], $ss)) return false;
                 else { $ss[] = $item['size'];}
                 return true;
              } );             
print_r($new);

result

Array
( 
  [0] => Array ( [size] => small )
  [2] => Array ( [size] => medium )
  [4] => Array ( [size] => large )
)

Values use once in an array from JSON

3 Answers3