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How to Connect MySQL DB on PHP

<?php
// Database Constants

// Checks whether a given named constant exists   if   null then it define the given constant variable.
defined('DB_SERVER') ? null : define("DB_SERVER", "localhost");
defined('DB_USER')   ? null : define("DB_USER", "root");
defined('DB_PASS')   ? null : define("DB_PASS", "password");
defined('DB_NAME')   ? null : define("DB_NAME", "my_db");
$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);
if (!$connection) {
die("Database connection failed: " . mysql_error());
} else {
$db_select = mysql_select_db(DB_NAME, $this->connection);
if (!$db_select) {
die("Database selection failed: " . mysql_error());
}
}
}

?>