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I done a project. I write a following php script and create the mysql database.But I run the php file they show me error. What is the error

<?php
$con=mysql_connect("localhost","root");...

I write this script and I also create the database.But it show an error.why

<?php
$con=mysql_connect("localhost","root");
if(!$con){
die('could not connect:'.mysql_error());
}
...