Create array of objects with individual values from an array of objects containing comma-delimited values

Question

Here, I have the following variable $countries_all:

Array ( 
  [0] => stdClass Object 
      ( 
          [countries] => India,Afghanestan,Japan,South Africa
      ) 
  [1] => stdClass Object 
      ( 
          [countries] => Singapore,South Africa,India,Pakistan
      )
  [2] => stdClass Object 
      ( 
          [countries] => Japan,Australia,India
      ) 
)

But i need to create second array $countries containing only unique values:

Array ( 
  [0] => stdClass Object 
      ( 
          [countries] => India
      )
  [1] => stdClass Object 
      ( 
          [countries] => Afghanestan
      )
  [2] => stdClass Object 
      ( 
          [countries] => Japan
      )
  [3] => stdClass Object 
      ( 
          [countries] => South Africa
      )
  [4] => stdClass Object 
      ( 
          [countries] => Singapore
      )
  [5] => stdClass Object 
      ( 
          [countries] => Pakistan
      )
  [6] => stdClass Object 
      ( 
          [countries] => Japan
      )
  [7] => stdClass Object 
      ( 
          [countries] => Australia
      ) 
)

For splitting by (,) I have used the below method

foreach ($countries_all as $list){
    $countrieslist=explode(',', $list->countries);
    foreach ($countrieslist as $uni_countries){
        echo $uni_countries;
    }
}

but how to get unique values?

Where do you get $countries from? Is that supposed to be $uni_countries? — OIS
– OIS, Commented Sep 28, 2013 at 10:10

OIS · Accepted Answer · 2013-09-28 10:36:26Z

2

The array_unique function is what you are looking for.

$countries = array();
foreach ($countries_all as $list){
    $countrieslist=explode(',', $list->countries);
    foreach ($countrieslist as $country){
        $countries[] = $country;
    }
}
$countries = array_unique($countries);

edited Sep 28, 2013 at 10:36

OIS

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answered Sep 28, 2013 at 10:13

Joe Axon

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Comments

crafter · Accepted Answer · 2013-09-28 10:12:12Z

1

$newlist = array();
foreach ($countries_list as $list){
    $countrieslist=explode(',', $list->countries);
    foreach ($countrieslist as $uni_countries){
        echo $uni_countries;
        $newlist[] = $uni_countries){
    }
}
array_unique($newlist);

answered Sep 28, 2013 at 10:12

crafter

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Comments

OIS · Accepted Answer · 2013-09-28 10:23:41Z

1

$commasplit = function ($list) { return explode(',', $list->countries); };
$countrieslist = array_unique(call_user_func_array('array_merge', array_map($commasplit, $countries_list)));

edited Sep 28, 2013 at 10:23

answered Sep 28, 2013 at 10:14

OIS

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Comments

The Alpha · Accepted Answer · 2013-09-28 10:39:21Z

1

You may try this

$countrieslist = array();
foreach ($countries_all as $list){
    $countrieslist[] = explode(',', $list->countries);
}
$array = array_unique(array_reduce($countrieslist,'array_merge', array()));

An Example.

edited Sep 28, 2013 at 10:39

answered Sep 28, 2013 at 10:19

The Alpha

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Comments

kao3991 · Accepted Answer · 2013-09-28 10:12:55Z

0

Try this:

$uniqueCountries = array();

foreach ($countries_list as $list){
    $countrieslist=explode(',', $list->countries);
    foreach ($countrieslist as $country){
        if (!in_array($country, $uniqueCountries)) {
            //adding to list
            $uniqueCountries[] = $country
        } else {
             echo $country, ' already in list', PHP_EOL;
        }
    }
}

$uniqueCoutries contains all found coutries, without duplicates

answered Sep 28, 2013 at 10:12

kao3991

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Comments

mickmackusa · Accepted Answer · 2022-09-04 22:22:24Z

Instead of asking array_unique or in_array() to perform extra cycles to weed out the duplicates, don't let the duplicate values in in the first place. You can rely on PHP's refusal to have duplicate keys in the same level of an array.

By assigning the single country value not only as the object property, but also as the first level key, you ensure that there be no duplication even if the same country is encountered again while iterating.

This technique will perform faster than earlier posted techniques on this page.

If you don't want the first level keys after iterating, you can re-index the array with array_values().

Code: (Demo)

$result = [];
foreach ($array as $obj) {
    foreach (explode(',', $obj->countries) as $country) {
        $result[$country] = (object) ['countries' => $country];
    }
}
var_export(array_values($result));

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