php 不能连接数据库 php error Can't connect to local MySQL server

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测试的php文件  <?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;  ?>  运行后报错  Can't connect to local MySQL server through socket '/tmp/mysql.sock'  但在 命令行中能进入mysql  [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>  解决办法  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