PHP cannot connect to database PHP error can ' t connect to local MySQL server_mysql

Test the PHP file
<?php
$link =mysql_connect (' localhost ', ' root ', ' zz ') or Die (Mysql_error ());
mysql_select_db (' test ') or Die (' no db ');
mysql_query (' SET NAMES utf8 ');
Echo 99;
?>
Error after run
Can ' t connect to the local MySQL server through socket '/tmp/mysql.sock '
But access to MySQL at the command line
[Root@localhost local]# mysql-u root-p
Enter Password:
Welcome to the MySQL Monitor. Commands End With; or \g.your MySQL connection ID is 3Server version:5.5.2-m2 Source distribution
Type ' help, ' or ' \h ' for help. Type ' \c ' to clear the buffer.
Mysql>
Solutions
Chown-r Root/usr/local/mysql
Chgrp-r Mysql/usr/local/mysql
Chown-r Root/usr/local/mysql/bin
Chgrp-r Mysql/usr/local/mysql/bin
Chgrp-r Mysql/var/lib/mysql
chmod 777/var/lib/mysql
Chown-r Root/var/lib/mysql/mysql
Chgrp-r Mysql/var/lib/mysql/mysql
chmod 777/var/lib/mysql/mysql
Chown-r root/var/lib/mysql/mysql/*
Chgrp-r mysql/var/lib/mysql/mysql/*
chmod 777/var/lib/mysql/mysql/*
chmod 777/usr/local/mysql/lib/mysql/libmysqlclient.a