Readme.md

Episode 03: Variables, Data Types, and Constants in PHP 📦

Welcome to Episode 03 of your PHP journey!
In this episode, we’ll learn all about variables, various data types, and how to use constants in PHP.

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🧠 What is a Variable?

A variable is a container used to store data like strings, integers, booleans, etc.

• All PHP variables start with a $ sign.
• PHP is loosely typed, so you don’t need to declare the type.

$name = "Aman";
$age = 24;

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🧪 PHP Data Types

PHP provides multiple built-in data types:

Type	Example	Description
String	"Hello"	Sequence of characters
Integer	24	Whole number
Float	81.23	Decimal number
Boolean	true, false	True/False values

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✅ Example Code

<?php
    $name = "Aman";
    $age = 24;
    $marks = 81.23;
    $isMarried = true;

    echo "My name is = " . $name;
    echo "<br>My age is = " . $age;
    echo "<br>My marks are = $marks%";
    echo "<br>Are you married = $isMarried";

    echo "<br><br>";

    var_dump($name);
    echo "<br>";
    var_dump($age);
    echo "<br>";
    var_dump($marks);
    echo "<br>";
    var_dump($isMarried);
?>

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🖨️ Output

My name is = Aman
My age is = 24
My marks are = 81.23%
Are you married = 1

string(4) "Aman"
int(24)
float(81.23)
bool(true)

🔎 true prints as 1 when echoed directly.

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🔒 Constants in PHP

Constants are like variables, but their values cannot be changed once defined.

✅ Syntax:

define("SITE_NAME", "Learn PHP with Varun");
echo SITE_NAME;

🚫 You don’t use $ with constants.

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🧵 Notes

• Use . for string concatenation in PHP.
• Use var_dump() to check type + value.
• Constants are global and accessible anywhere.

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📂 File Structure

htdocs/
└── php-tutorial/
    └── Episode_03_Variables/
        └── variables.php

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🚀 Up Next

→ Episode 04: Constants and Comments in PHP

In the next episode, we’ll explore how to use comments in PHP and go deeper with constants!

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💡 Pro Tip

Try changing values and types in your code to see how PHP behaves. Practice is the key to confidence! 🔥