PHP (Hypertext Preprocessor) is an open-source scripting language widely used for web development, executing on the server to create dynamic websites. Key features include its free use, compatibility with major operating systems, and ability to handle databases, making it suitable for various applications like content management systems and e-commerce platforms. A basic understanding of HTML, PHP, and SQL is necessary for creating functionalities like user login systems, incorporating security measures like prepared statements to prevent SQL injection.

1. Server – side
Technologies
Server-side scripting language (PHP)
MARIO B. CADAY
Instructor I

2. INTRODUCTION
PHP (Hypertext Preprocessor) is a widely-
used, open-source scripting language that is
especially suited for web development. It is
executed on the server, meaning that PHP
scripts are processed by the server and the
result is sent to the client (usually in the form
of HTML).

3. Key Features of PHP:
• Open Source: PHP is free to download and use.
• Server-Side Scripting: PHP scripts run on a web server, enabling
the development of dynamic websites that interact with databases
and handle forms.
• Cross-Platform: PHP works on all major operating systems like
Windows, Linux, and macOS.
• Embedded in HTML: PHP can be easily embedded into HTML
code, making it flexible for developers.
• Interacts with Databases: PHP supports a wide range of
databases, including MySQL, PostgreSQL, Oracle, and many
others.

4. Applications of PHP:
• Dynamic Web Pages: PHP can create dynamic content,
like retrieving information from databases.
• Form Handling: PHP allows websites to handle data
submitted by users through forms.
• Content Management Systems (CMS): Popular CMS
platforms like WordPress, Joomla, and Drupal are built
using PHP.
• E-commerce: Many e-commerce platforms like Magento
and OpenCart are PHP-based.

5. Basic PHP Syntax:
•A PHP script starts with <?php and ends with ?>.
Here’s a simple example of a PHP script that
outputs "Hello, World!":

6. Why Use PHP?
• Simplicity: PHP is relatively easy to learn for beginners,
especially for those with basic knowledge of HTML.
• Large Community and Support: Being popular for over
two decades, PHP has extensive documentation and a
large community of developers.
• Scalability: PHP can handle simple websites to large-
scale enterprise applications efficiently.
• PHP continues to be a relevant tool in web development,
especially for server-side programming.

7. CREATING LOGIN FUNCTIONALITY
•Creating a login system using PHP is a
common task in web development. Below is
a basic example of how to build a simple PHP
login system. It includes a form for users to
enter their credentials, checks the credentials
against stored values (in a database), and
logs the user in if they are correct.

8. Prerequisites:
•Basic knowledge of HTML, PHP, and SQL.
•A database (e.g., MySQL) to store user
credentials.

9. Create the Database and Table

11. Fill in the textbox example
‘login_system’
Then click create

12. Create table ‘users’ then click Go
button

13. Set user_id in the text field and make sure to
check the Auto increment (A_I) checkbox
Set type to VARCHAR and set the length/Values
to 255
THEN Click Save button

14. Click insert Tab
Set username and password
Example
Username: test@gmail.com
Password: test12345
Then Click Go Button

15. Login form HTML

16. Database Connectivity

17. Checking form query from users table

18. In PHP, bind parameters are used to safely
execute SQL queries with prepared statements,
which help prevent SQL injection attacks.

20. Session start()

21. END

24. Login Session