Learn how to create websites using PHP — it's simple and clear!

What is PHP and why should you learn it?

PHP is a programming language that helps make websites smart. For example, it can show you your name after logging into your account, remember what you added to your cart, or process a message you sent through the feedback form.

PHP is used to work on the server side. This means that it runs on the computer where the site is located, not on your device. For example, when you visit a page, the server processes your request using PHP and sends you the result.

Why is PHP popular?

1. Simplicity
   PHP is one of the easiest programming languages to learn, even for beginners.

2. Versatility
   It can be used to create a variety of sites, from small blogs to large online stores.

3. Wide application
   Most sites, including WordPress, use PHP to work.

4. Database support
   PHP can interact with databases to store and retrieve information.

Where is PHP used?

1. Website development
   PHP is responsible for processing data sent by the user, creating pages, and working with databases.

2. Online stores
   PHP allows you to do such functions as adding products to the cart, placing orders and processing payments.

3. Feedback
   It can be used to process forms that users fill out on the site.

Examples of programs in PHP

1. First program: text output

Let's start with the simplest: we will display the text on the screen.

<?php
echo "Welcome to my website!";
?>

Explanation:

• <?php indicates the beginning of the program.

• echo displays the text you want to show on the site.

• "Welcome to my website!" is the text that will appear on the page.

Result:

Welcome to my website!

2. Using variables

Variables are containers that store data, such as text or numbers.

<?php
$name = "Alice"; // Here the $name variable stores the text
$age = 15;       // And this variable stores the number

echo "Name: $name<br>";
echo "Age: $age<br>";
?>

Explanation:

• Variables start with $, for example, $name or $age.

• "$name" inserts the value of the variable into the text.

• <br> adds a line break so that the text does not merge.

Result:

Name: Alice  
Age: 15

3. Working with mathematics

PHP can easily perform calculations.

<?php
$a = 10;
$b = 20;
$sum = $a + $b; // Adding numbers

echo "The sum of $a and $b is $sum.";
?>

Explanation:

• The $a and $b variables store the numbers 10 and 20.

• $sum = $a + $b adds the values of the variables and saves the result in $sum.

• "The sum of $a and $b is $sum." shows the result of the addition.

Result:

The sum of 10 and 20 is 30.

4. Terms

You can use conditions to check data and perform various actions.

<?php
$score = 85;

if ($score >= 90) {
    echo "Your grade is A.";
} elseif ($score >= 75) {
    echo "Your grade is B.";
} else {
    echo "Your grade is C.";
}
?>

Explanation:

• if ($score >= 90) checks if the value of the variable $score is greater than 90. If yes, "Your grade is A" is displayed.

• elseif ($score >= 75) checks whether the result is between 75 and 90.

• If none of the conditions are met, the program displays "Your grade is C".

Result:

Your grade is B.

5. Form processing

Let's make a simple form that takes a user's name and greets them.

<form method="post">
    Enter your name: <input type="text" name="username">
    <input type="submit" value="Submit">
</form>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["username"]; // Get the entered name
    echo "Hello, $name! Welcome to the site.";
}
?>

Explanation:

• The HTML form sends data via the POST method.

• In PHP, the variable $_POST["username"] receives the entered name.

• echo "Hello, $name!" displays a greeting with the user's name.

6. Cycles

Loops allow you to repeat the same action several times.

<?php
for ($i = 1; $i <= 5; $i++) {
    echo "This is message number $i.<br>";
}
?>

Explanation:

• for ($i = 1; $i <= 5; $i++) starts the variable $i from 1 and increases it until it is greater than 5.

• echo displays a message with the current number $i.

Result:

This is message number 1.  
This is message number 2.  
This is message number 3.  
This is message number 4.  
This is message number 5.

Why learn PHP?

1. Simple language
   Even if you are just starting to program, PHP will be clear to you.

2. A large number of materials
   PHP has been used by developers around the world for many years, so you will find many tutorials and examples.

3. Demand
   Most websites on the Internet run on PHP, so programmers who know this language will always be in demand.

Conclusion

PHP is a simple and powerful programming language that is suitable for creating websites and web applications. If you want to learn how to make smart and interesting websites, PHP will be a great choice to start with. Try the examples from this article, and you will see that programming is easy and fun!