CODEWITHSUNDEEP
phparrays
You Old Fool
You Old Fool

Reputation: 22941

Create an Array with only unique values

I looping through a large dataset (contained in a multidimensional associative array $values in this example) with many duplicate index values with the goal of producing an array containing only the unique values from a given index 'data'.

Currently I am doing this like:

foreach ($values as $value) {
   $unique[$value['data']] = true;
}

Which accomplishes the objective because duplicate array keys simply get replaced. But this feels a bit odd since the indexes themselves don't actually contain any data.

It was suggested that I build the array first and then use array_unique() to removes duplicates. I'm inclined to stick with the former method but am wondering are there pitfalls or problems I should be aware of with this approach? Or any benefits to using array_unique() instead?

Upvotes: 0

Views: 1867

Answers (1)

Cacique Taino
Cacique Taino

Reputation: 86

I would do it like this.

$unique = array();
foreach($values as $value) {
if(!in_array($value, $unique) {
         $unique[] = value;
    }
}

Upvotes: 1

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