MySql database connection compress - php

Question

How do i compress these two following database connection codes into one code?
Code1
<?Php
define($base_url = 'http://example.com/url/'); // Change this to your site URL and Path
define($from_email = 'example#email.com'); // Change this email id to your id
///////// Database Details change here ////
define($dbhost_name = 'mysql.host.com');
define($database = 'databasename123');
define($username = 'username123');
define($password = 'password123');
//////// Do not Edit below /////////
try {
$dbo = new PDO('mysql:host=localhost;dbname='.$database, $username, $password);
} catch (PDOException $e) {
print "Error!: " . $e->getMessage() . "<br/>";
die();
}
?>
Code2
<?php
define('DB_HOST', 'mysql.host.com');
define('DB_NAME', 'databasename123');
define('DB_USER','username123');
define('DB_PASSWORD','password123');
$con=mysql_connect(DB_HOST,DB_USER,DB_PASSWORD) or die(header('Location: ./admin/install.php'));
$db=mysql_select_db(DB_NAME,$con) or die(header('Location: ./admin/install.php'));
?>
If there is no possibilities, what is the best way to solve this problem?
Thank you on beforehand

Answer 1

One of your snippets uses PDO and the other uses mysql_connect. Combining them completely is non-trivial, however you could put your database host, name, username and password as variables in another file and then include that file in both the bits of code you have provided. That would at least mean you could update all the database details in one place.