[jasperschellekens]

You might be using strcmp wrong. It can be a very confusing function if you want it to work properly.
I, personally am not a big fan of strcmp.

Best would be to use AND to check for password inside your query.
Also, use num rows instead of comparing a string.

PHP код:

WP_Hash(hashpass, sizeof(hashpass), inputtext);
mysql_format(MySQL, query, sizeof(query), "SELECT * FROM `users` WHERE `Name` = '%e' AND `Password` = '%e'  LIMIT 1", GetName(playerid), hashpass);
if(mysql_num_rows(query) != 0)
{
 // password correct
} else {
 // wrong password/username
}