Problems with phpmyadmin connecting to mysql_PHP tutorial

I installed a system today, debian's etch version, MySQL (the best combination with PHP) are all configured, but using php (as the current mainstream development language) myadmin 2.11.0 connects to MySQL(the best combination with PHP)General tips
#1045 - access(favorite for small websites) denied for user root@ localhost (using password: YES) is wrong, but the password is obviously correct and there is no problem in the command line.

Like this situation, php (as the current mainstream development language)myadmin uses [auth_type] = http; which is fine, but why can’t cookies? Later, I guessed that there is a problem with Session processing of php(as the current mainstream development language)? From the session file of /var/lib/php(as the current mainstream development language)5, we found the root password, which contains the "&" character, php(as the current mainstream development language) Development language) is encoded as “&”. Is it really the same here?

Anyway, I deleted the session file of php(as the current mainstream development language), and also deleted the root user of MySQL(the best combination with PHP) I removed the & in the password, and then logged in normally, which is a bit strange