PHP user registration system

Here we will introduce the detailed code of the PHP user registration system. For more information, see. So far, you have learned enough about PHP. It's time to write a small program.

User registration system

Write an index. php page with a user name and password form. submit the post to check. php and output the md5 values of the user name and "user name + Password ".
Create a local mysql database named segmentfault and create a table user. the username password field stores the content received by check. php.
Complete the HTML section first:

RegisterRegister

Note: HTML5 supports forms much better than HTML in previous versions. you can directly specify various types. For example, if type = "email" is set, the system checks whether the email address submitted by the user is valid.

Check. php.

Registered successfully!Wow, you have registered successfully!
Er ...... However, it seems that registration is useless because the website does not have any other functions except registration.
So, as compensation, I will tell you the md5 value of your "mailbox + Password.
Your email address is:

Below is the PHP part, which is embedded directly into HTML, which is the advantage of PHP:

<? Php $ username = htmlspecialchars ($ _ POST ["name"]); echo $ username;?>
The md5 value of your "email + password" is: <? Php $ passphrase = htmlspecialchars ($ _ POST ["passphrase"]); $ md5sum = md5 ($ username. $ passphrase); echo $ md5sum;

Note that htmlspecialchars is used to prevent users from entering strange things.

Next, we use mysqli for database operations. (mysql has been deprecated. now mysqli is recommended. of course you can also use PDO .)

First, we specify some information about the database:

$db_server = "localhost";$db_user = "db_user";$db_pass = "password";$db_name = "segmentfault";

Connect to the database and ensure the connection is normal:

$conn = new mysqli($db_server, $db_user, $db_pass, $db_name);if (mysqli_connect_errno()) { trigger_error("Database connection failed: " . mysqli_connect_error(), E_USER_ERROR);}

Create a table using SQL statements

The code is as follows:

$ SQL = "CREATE TABLE user (username CHAR (140), password CHAR (140 ))";

Add record

The code is as follows:

Mysqli_query ($ conn, "insert into user (username, password) VALUES ($ username, $ md5sum )");

Handwriting SQL is not very good. in actual application, the framework will provide you with various conveniences.

Close the database:

mysqli_close($conn);?>

Well, we have successfully written a small application and learned how to access the MySQL database. This is today.