PHP Error handling: die() Vs trigger_error() Vs throw Exception

并且理解抛出异常更好

如何在此代码中替换die并使用throw异常： –

<?PHP
# FileName="Connection_PHP_MysqL.htm"
# Type="MysqL"
# HTTP="true"
$hostname_db = "localhost";
$database_db = "database";
$username_db = "root";
$password_db = "password";
$db = MysqLi_connect($hostname_db,$username_db,$password_db) or die("Unable to connect with Database"); 
?>