更新貶值的mysql_connect（）

Question

，我有以下的PHP代碼連接我的數據庫mysql_connect（）函數，但我不斷收到以下警告：

推薦使用：mysql_connect（）函數：mysql擴展已被棄用，並且將在被刪除未來：使用mysqli或PDO代替.....

什麼會正確的方式來更新此連接，所以我沒有任何問題在未來？

<?php 
 
//CREATED BY ... 
 
/* 
 
1: "die()" will exit the script and show an error statement if something goes wrong 
 
2: A "mysql_connect()" error usually means your username/password are wrong 
 
3. A "mysql_select_db()" error usually means the database does not exist 
 
*/ 
 
//Place db host name. Sometimes "localhost" but 
 
//sometimes looks like this: >> ???mysql??.someserver.net 
 
$db_host = "localhost"; 
 
//Place the username for the MySQL database here 
 
$db_username = "..."; 
 
//Place the password here: 
 
$db_pass = "..."; 
 
//Place the name for the MyS 
 
$db_name = "..."; 
 

 
//Run the connection right here! 
 
mysqli_connect("$db_host","$db_username","$db_pass") or die ("could not connect"); 
 
mysql_select_db("$db_name") or die("no databases"); 
 
?>

Answer 1

try { 
    $dbh = new PDO("mysql:dbname=$db_name;host=$db_host", $db_username, $db_pass); 
} catch (PDOException $e) { 
    echo 'Connection failed: ' . $e->getMessage(); 
} 

更多信息看這裏http://php.net/manual/de/pdo.prepare.php