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From: "J.O. Aho" <user@example.net>
Newsgroups: comp.lang.php
Subject: Re: Connecting to MySQL server....
Date: Sun, 07 Apr 2013 09:06:47 +0200
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On 07/04/13 05:23, nag wrote:
> Hi,
>
> I have debconnect.php like the following...
>
>
> <?php
>
> $con=mysql_connect("localhost","root","") ;
>
> if(!$con){
>          die('Error in Connection: '. mysql_error());
>          }
>          mysql_select_db('newdb',$con);
>
> ?>
>
>   If I give the password or user name wrong it is flashing the error, but if the database name wrong it is simply displaying a blank php file. How can I change the above to show the error even if the wrong database name is given.

Check the example in the online documentation page.
http://www.php.net/manual/en/function.mysql-select-db.php

It's not the perfect way to do it. I would suggest you used try/catch 
and throw an exception, the catch would tell the user that there is some 
issues (do not show what went wrong, as that can be used to hack your 
site), keep in mind to generate the theme outside the try/catch, this 
way all pages will look nice no matter what happens.
Use syslog http://www.php.net/manual/en/function.syslog.php
to log what went wrong, now you have somewhere to find all the errors 
and without displaying it to the whole world.

-- 

  //Aho