remove duplicates from comma separated string

Question

Is there a better (faster) solution to remove duplicates from a comma separated string?

public function d($dep) { 
    if (strpos($dep,\',\') !== false) {
           


        

Answer 1

I would probably use the same kind of idea that what you posted ; but I think you can remove your two conditions, to use only this :

$exploded = explode(',', $str);
$unique = array_unique($exploded);
$imploded = implode(',', $unique);
var_dump($imploded);

I've tested it with those three strings, and it seems to work in each case :

$str = 'a,b,c,d,a,c,e,f';
$str = 'a,a';
$str = 'a';

Notes :

• Using explode on a string that doesn't contain the delimiter will return an array with one element -- your test with strpos is not necessary.
• And using implode on an array with only one element will work too (not adding any delimiter) -- your test with the ternary operator is not necessary either.

Of course, you can also remove the variables, and use only one line :

$result = implode(',', array_unique(explode(',', $str)));

Not sure it's easier to understand that way, though...