mysql and mysqli connect

This may seem extremely weird; however, i have a problem with mysql_connect and mysqli_connect

PHP Code:

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$host = "localhost";
$username = "";
$password = "";
$database = "bcelements";

//Dies
$con = mysqli_connect($host,$username,$password, $database) or die("Couldnt Connect to MYSQL!");

//Doesn't die
$con = mysql_connect($host,$username,$password, $database) or die("Couldnt Connect to MYSQL!");
$con = mysqli_connect($host,$username,$password); 


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If i use

PHP Code:

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$con = mysqli_connect($host,$username,$password); //or $con = mysql_connect($host,$username,$password);
$selected = mysql_select_db($database, $con) or die("Crap you died"); //Dies 


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It still dies. Anyone have an idea of the problem?

Well I fixed the errors. Just letting everyone know this for their personal information:
localhost on php

PHP Code:

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$host = "127.0.0.1"; 
$username = "root"; 
$password = ""; 
$database = "bcelements";
$con = mysqli_connect($host,$username,$password, $database) or die("Couldnt Connect to MYSQL!"); 


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