Detailed explanation of how to implement expiration customer reminders in PHP

With the development of the Internet, more and more companies are beginning to use websites to promote their products, services and related information. Website building has become an indispensable tool, and php has become a very important technology. PHP is a server-side scripting language that is widely used in website development. It has the advantages of easy learning, fast development speed, and high operating efficiency. In the development of corporate websites, it is often necessary to implement some regular reminder functions, such as reminders for expired customers. This article will introduce how to implement expiration customer reminders in PHP.

1. Database design

In order to realize the expired customer reminder function, customer information needs to be stored in the database. This implementation will use the MySQL database and design the following table:

Table name: client_info

Fields: id, name, phone, email, expire_date

where id is the customer number , name is the customer's name, phone is the customer's contact number, email is the customer's email address, expire_date is the customer service expiration date. In the implementation of this article, the date format of expire_date field will use yyyy-mm-dd.

2. Implementation Principle

The implementation principle of the expired customer reminder function is to determine which customers have expired by calculating the current date, and then send email reminders to these customers. PHP provides the date() function to obtain the current date in the format of yyyy-mm-dd.

In PHP, you can use the MySQL database connection functions mysql_connect() and mysql_select_db() to connect to the database and select the database to be used. SQL statements can be executed in PHP by executing the mysql_query() function. MySQL also provides related date calculation functions, such as DATE_ADD() and DATEDIFF(), which can be used to calculate the number of days between the customer service expiration date and the current date. , to determine which customers have expired. Finally, you can use PHP's built-in function mail() to send email reminders to expired customers.

3. PHP code implementation

Next, let’s take a look at how to implement the PHP code for expiring customer reminders.

1. Connect to the database

First you need to connect to the MySQL database. In the code, we use the mysql_connect() function to connect and store the relevant information in variables, as follows:

<?php $host = "localhost";     //主机名，在本机上可以填localhost，其他情况请咨询管理员
$user_name = "root";     //用户名
$user_pwd = "";     //密码
$db_name = "test";     //数据库名

$link = mysql_connect($host, $user_name, $user_pwd) or die("连接数据库失败！");

mysql_select_db($db_name, $link) or die("选择数据库失败！");
?>

Here we are connecting to the local MySQL database, and the username and password can be empty.

2. Calculate expired customers

In order to determine which customers have expired, you need to calculate the number of days between the current date and the customer service expiration date. You can use the DATEDIFF() function in the SQL statement to achieve this, as follows:

SELECT * FROM client_info WHERE DATEDIFF(expire_date, CURDATE()) <p>The meaning of this SQL statement is to query the records that are within 7 days or less between the expire_date field and the current date, that is, the service will be in 7 days Customers due within days. </p><p>3. Send email reminder</p><p>All expired customers have been identified, and now you need to send email reminders to these customers. You can use PHP's built-in function mail() to achieve this, as follows: </p><pre class="brush:php;toolbar:false"><?php $to = "client_email@example.com";     //客户邮箱地址
$subject = "服务到期提醒";     //邮件标题
$message = "尊敬的客户，您的服务将在7天内到期，请及时续费。";     //邮件内容
$headers = "From: service@example.com";     //发件人地址，可以替换为自己的邮箱

mail($to, $subject, $message, $headers);
?>

It should be noted that after testing, the mail() function needs to open the SMTP service in the form of port 80 when running. If you are using PHP code runs on your local machine, so no special settings are required. But if you are hosted in the cloud or VPS and your business applies for other ports, you need to configure the corresponding ports, otherwise the mail() method cannot be used.

The complete php code is as follows:

<?php $host = "localhost";     //主机名，在本机上可以填localhost，其他情况请咨询管理员
$user_name = "root";     //用户名
$user_pwd = "";     //密码
$db_name = "test";     //数据库名

$link = mysql_connect($host, $user_name, $user_pwd) or die("连接数据库失败！");

mysql_select_db($db_name, $link) or die("选择数据库失败！");

$result = mysql_query("SELECT * FROM client_info WHERE DATEDIFF(expire_date, CURDATE()) <= 7");

while ($row = mysql_fetch_assoc($result)) {
    $to = $row["email"];
    $subject = "服务到期提醒";
    $message = "尊敬的客户，您的服务将在7天内到期，请及时续费。";
    $headers = "From: service@example.com";

    mail($to, $subject, $message, $headers);
}

mysql_close($link);
?>

4. Summary

The above is the method and code implementation of php to realize expiration customer reminder. Through the above learning, I believe you will be able to handle similar business logic very skillfully and use it flexibly in other situations. Please also pay attention to the choice of php version. It is recommended to use php7.3 or above.

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