Question

I have a comma delimited string and want the first 100 entries (not including the 100th comma) as a single string.

So for example if I had the string

a,b,c,d,e,f,g

And the problem was get the first 3 entries, the desired result string would be

a,b,c

Answer 1

Using explode/implode:

$str     = 'a,b,c,d,e,f,g';
$temp1   = explode(',',$str);
$temp2   = array_slice($temp1, 0, 3);
$new_str = implode(',', $temp2);

Using regex:

$new_str = preg_replace('/^((?:[^,]+,){2}[^,]+).*$/','\1',$str);