Dedicated windows 2008r2-Web page error(SQL CONNECT)

Guy i getting error on web pages.I have dedicated server with windows server 2008r2 standart edition.
I cant making the mssql_connect
my server pc name : WIN-VDCSPQGOPU6\SQLEXPRESS
and my config settings :

$serverIp = "WIN-VDCSPQGOPU6\SQLEXPRESS";
$userName = "sa";
$password = "1234";
$dbName1 = "SRO_VT_ACCOUNT";
$dbName2 = "SRO_VT_SHARD";
please help me i need it.



GETTING THIS ERROR : "Couldn't connect to server WIN-VDCSPQGOPU6\SQLEXPRESS"

WIN-VDCSPQGOPU6\SQLEXPRESS
Isn´t a IP

u must write there sql connector name....