PHP Variables

PHP

Variables in PHP start with a $ sign. No need to declare the type — PHP figures it out automatically.

Rules

Must start with $ followed by a letter or underscore
Case-sensitive: $name and $Name are different
No need to declare type (string, int, etc.)

Example — PHP

<?php
$name = "Rahul";
$age = 20;
$height = 5.8;
$isStudent = true;

echo "Name: " . $name . "<br>";
echo "Age: " . $age . "<br>";
echo "Height: " . $height . " feet<br>";
echo "Student: " . ($isStudent ? "Yes" : "No");
?>

Result

Name: Rahul
Age: 20
Height: 5.8 feet
Student: Yes

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Interview Questions — PHP Variables

5 questions commonly asked in interviews

Q1 What are variables in PHP? Beginner

Variables store data values and start with $ symbol.

Q2 How to declare variable? Beginner

Use $ followed by name, e.g., $x = 10;

Q3 Is PHP typed language? Intermediate

PHP is loosely typed.

Q4 What is scope? Intermediate

Scope defines where variable can be accessed.

Q5 What is global keyword? Advanced

Used to access global variable inside function.

Frequently Asked Questions

Common doubts about PHP Variables

No, PHP auto-detects type.

No.

Yes for variables.

Yes.

Value that cannot change.

Test Your Knowledge

5 questions · Earn 50 XP

0 / 5

Q1 Variable starts with?

Q2 Which is valid?

Q3 PHP is?

Q4 Scope defines?

Q5 Global keyword is used?

More on PHP Variables

Cheatsheet, tips, resources & what to learn next

Quick Cheatsheet

Variable

$x = 10;

String

$name = \"John\";

Global

global $x;

Constant

define(\"PI\", 3.14);

Echo

echo $x;

Pro Tips

Always use $ symbol.

Use meaningful names.

Avoid global variables.

Use constants when needed.

Keep variables simple.

Resources

PHP Variables Docs Docs

W3Schools Variables Practice

TutorialsPoint Docs

freeCodeCamp Practice

PHP Video Video

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