我有一个简单的“即将推出”页面，我在该页面上订阅了我打算插入 mysql 数据库的电子邮件。
我之前运行过代码，但现在在 1-2 周后回到它，似乎有一些问题。
基本上只涉及 2 个文件：index.html和subscribe.php. index.html是实际的“即将推出”页面，它要求subscribe.php将电子邮件实际插入数据库，前提是它是有效的电子邮件，不是重复的等等。
下面给出了代码subscribe.php。它真的是一个非常简单的代码。
不要以为这是以前的工作！但是，现在使用 PDO 的行似乎出现“找不到类 PDO ...”错误：
<?php
function isValidEmail( $email = null )
{
return preg_match( "/^
[\d\w\/+!=#|$?%{^&}*`'~-]
[\d\w\/\.+!=#|$?%{^&}*`'~-]*@
[A-Z0-9]
[A-Z0-9.-]{0,61}
[A-Z0-9]\.
[A-Z]{2,6}$/ix", $email );
}
try {
// Connect to the SQLite Database.
$db = new PDO('mysql:host=hostnamehere;dbname=dbnamehere', 'usernamehere', 'passwordhere');
} catch(Exception $e) {
die('connection_unsuccessful');
}
/* Check if table exists */
$db->exec('CREATE TABLE IF NOT EXISTS subscribers (email VARCHAR(255), time VARCHAR(255))');
/* Check if email has been posted */
if ( isset($_POST['email']) ) {
/* Validate email */
if ( isValidEmail($_POST['email']) ) {
/* Check for duplication */
$query = $db->prepare('SELECT COUNT(*) AS count FROM subscribers WHERE email = :email');
$query->execute(array(':email' => $_POST['email']));
$result = $query->fetch();
if ( $result['count'] == 0 ) { // E-mail is unique.
$query = $db->prepare('INSERT INTO subscribers (email, time) VALUES (:email, :time)');
$query->execute(array('email' => $_POST['email'], 'time' => date('Y-m-d H:i:s')));
/* Send mail notification */
$to = 'newsubscriber@xyz.com'; // Email notified of the new subscription
$subject = 'New subscriber';
$message = 'Hi, you have one new subscriber. This is his/her e-mail address: ' . $_POST['email'] . '.';
$headers = "From:" . $_POST['email'];
mail($to,$subject,$message,$headers);
echo 'successful';
} else { // E-mail is already being used.
echo 'already_subscribed';
}
} else {
echo 'invalid_email';
}
}