Remove duplicate items in array that have comma separating values [duplicate]

Question

I have an array of languages that looks like this: (this data is pulled from mysql stored as: e.g. field value: greek, polish)

 Array
(
[0] => 
[1] => french
[2] => french, greek
[3] => german
[4] => greek
[5] => greek, polish
[6] => italian
[7] => spanish
[8] => spanish, italian
[9] => spanish, portuguese
)

I have tried using array_unique($languages) but the output stays the same.

I assume it is because of the comma.

Any idea on how to just have unique values? e.g. one each of: french, greek, german, polish, italian, spanish, and portuguese?

splash58 · Accepted Answer · 2016-05-17 15:18:02Z

2

Make a plain array from input

$res = array();
foreach ($array  as $item)
  $res = array_merge($res, explode(', ', $item));

and then use array_unique($res)

answered May 17, 2016 at 15:18

splash58

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maximkou · Accepted Answer · 2016-05-17 15:17:53Z

2

$data = array_map(function ($item) {
    // explode values by "," and trim spaces
    return array_map('trim', explode(',', $item));
}, $your_data);

// merge all nested arrays from $data and return unique
return array_unique(
    call_user_func_array('array_merge', $data);
);

Your result will be:

Array
(
[0] => 
[1] => french
[2] => greek
[3] => german
[4] => polish
[5] => italian
[6] => spanish
[7] => portuguese
)

answered May 17, 2016 at 15:17

maximkou

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2 Comments

maximkou Over a year ago

@user2413654. Ok. Splash58's code less, because he not trim values.

mickmackusa Over a year ago

It is not necessary for splash58 to trim the values, because explode() is (properly) splitting on all comma-space instances.

CherryDT · Accepted Answer · 2016-05-17 15:28:48Z

1

Possible solution:

function getUniqueSubValues($array) {
    $result = [];
    foreach($array as $element) {
        $result += preg_split('/\s*,\s*/', $element);
    }
    return array_unique($result);
}

I'm looping over all values inside the array and splitting each of them further into subvalues.

I'm using preg_split('/\s*,\s*/', ...) instead of explode(',', ...) because otherwise the space after the , would be kept and we would have to trim it.

I'm merging all subvalues into the results array, and at the end I'm returning the unique values of that array.

answered May 17, 2016 at 15:28

CherryDT

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