Question

I have been trying to match my one variable with the other. All I want that variable let’s say $word contains no matter what in it matches with the the other variable lets say $search_in and echo results accordingly.

I have been using if (preg_match("/$word/i", $search_in)) echo "matches"; but I am getting a lot of warnings like the following as I applied regexp on the values being returned from DB.

Warning: preg_match() [function.preg-match]: Unknown modifier ‘(‘

Warning: preg_match() [function.preg-match]: Unknown modifier ‘T’

Answer 1

$word most likely contains a slash in it.

You should use stripos for this, since you don’t need the power of regular expressions at all:

if (stripos($search_in, $word) !== false) echo 'matches';

For the record, the preg_match way of doing it would be:

if (preg_match('/'.preg_quote($word, '/').'/i', $search_in)) echo 'matches';

Always prefer the string functions to regular expressions when the former can do the job.