php连接mysql报错No such file or directory

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<?php

$con = mysql_connect("localhost","root","zengjie2");

if (!$con)

{

    die('Could not connect: ' . mysql_error());

}

else

{

    echo "ok";

}

?>

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Warning: mysql_connect(): No such file or directory in /usr/local/nginx/html/mysql.php on line 3

Could not connect: No such file or directory

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Connection id:   4

Current database:

Current user:    root@localhost

SSL:     Not in use

Current pager:   stdout

Using outfile:   ''

Using delimiter:    ;

Server version:  5.1.73 Source distribution

Protocol version:   10

Connection:  Localhost via UNIX socket

Server characterset:    latin1

Db     characterset:    latin1

Client characterset:    latin1

Conn.  characterset:    latin1

UNIX socket:     /var/lib/mysql/mysql.sock

Uptime:  14 min 29 sec

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cd /tmp

ln -s /var/lib/mysql/mysql.sock mysql.sock

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cd /var/lib

mkdir mysql

cd mysql

ln -s /tmp/mysql.sock mysql.sock