Replace string "white-spaces" with "comma" and remove all but 5 first words

Question

Need a little help with string formatting...

I have a string like this:

Bmw m3 fully equipped and low mileage

I need to replace whitespaces with commas, and also at the same time remove all special characters (all non number non letter characters except swedish å ä ö)

Then I need to remove all but the first 5 words, or you could say everything behind the fifth comma sign.

I want something like this from the string above:

Bmw,m3,fully,equipped,and

Thanks

Answer 1

mhmmm try this:

$string = "Bmw m3 fully equipped and low mileage";
$str = implode(',', explode(' ',$string,5));
echo substr($str,0,strpos($str, ' '));

not tested though....

Answer 2

(Result)

$res = preg_replace('/[^a-z0-9åäö\s]/ui', '', $theString);
$arr = preg_split('/\s+/', $res, 6);
echo implode(',', array_slice($arr, 0, 5));

This assumes you want to join multiple consecutive spaces (e.g. foo    bar) together (foo,bar).