I want to make a search that you can put the e-mail of the username and it will give you the result.
But for some reason it don't works...
I think this is wrong:
$w_search = "WHERE u.user_name LIKE '%$q%' AND u.user_email LIKE '%$q%'";
SELECT u.user_id, u.user_name, u.user_rank, u.user_email, p.p_name, p.p_profimg FROM u_registered AS u LEFT JOIN u_profile AS p ON u.user_id = p.user_id '.$w_search.' ORDER BY u.user_id
Your problem is that you have TWO conditions on your where clause what is probably making it to "not work", see you have:
WHERE u.user_name LIKE '%$q%' AND u.user_email LIKE '%$q%'
Which means that the user you are looking for need to have that
$q in PART (that is what
like is for) of its name (
user_name) AND at the same time in part of it's emails. So you if you have a guy that his name is Bart and his email is firstname.lastname@example.org your query will never return it because one filter will return true and the other return false.
The correct way is to have one of then depending on what
$q is or both with an OR operator so:
WHERE u.user_name LIKE '%$q%' OR u.user_email LIKE '%$q%'
But if this is some kind of test if the name or email is exactly as given in the database you need:
WHERE u.user_name = '$q'
WHERE u.user_email = '$q'