Warning: MySQL Connection Failed: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111) in /var/www/html/test.php on line 4
Could not connect
Problem: mysql sever not talking to php
Solution: Edit /etc/my.cnf to point to /var/lib/mysql/mysql.sock
note you may need to create the directory in /var/lib
also Important to change the ownership of the mysql directory using chmod -0777
Here is a listing of the way the directory should look.
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[root@hobbes mysql]# ls /var/lib/mysql  
mysql.sock
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note mysql.sock should be pink! 

here is part of the mysql conf file which should be modified to handle correct volume of traffic.
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# The following options will be passed to all MySQL clients
[client]
#password	= your_password
port		= 3306
socket		= /var/lib/mysql/mysql.sock

# Here follows entries for some specific programs

# The MySQL server
[mysqld]
port		= 3306
socket		= /var/lib/mysql/mysql.sock
skip-locking
set-variable	= key_buffer=16M
set-variable	= max_allowed_packet=1M
set-variable	= table_cache=64
set-variable	= sort_buffer=512K
set-variable	= net_buffer_length=8K
set-variable	= myisam_sort_buffer_size=8M
log-bin
server-id	= 1
user		= mysql
# Point the following paths to different dedicated disks
#tmpdir		= /tmp/		
#log-update 	= /path-to-dedicated-directory/hostname

# Uncomment the following if you are using BDB tables
#set-variable	= bdb_cache_size=4M
#set-variable	= bdb_max_lock=10000
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Good Luck Hope this Helps!