PHP Data Types

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PHP data types determine the specific nature of the data stored within a variable. PHP automatically determines variable types based on assigned values since it operates as a dynamically typed language without the need for explicit type declarations.

php-datatypes

PHP Data Types

String

Single or double quotes hold a series of characters in PHP.

 

$name = "Alice";
echo "Hello, $name!";

Integer

Whole numbers (positive or negative).

 

$age = 25;
$year = -2024;

Integer

Whole numbers (positive or negative).

 

$age = 25;
$year = -2024;

Float (Double)

Decimal numbers.

$price = 19.99;
$pi = 3.1416;

Boolean

Represents either true or false.

 

$isActive = true;
$isLoggedIn = false;

Array

Holds multiple values in a single variable..

 

$colors = ["Red", "Green", "Blue"];
echo $colors[0];  // Output: Red

Object

An instance of a user-defined class.

 

class Car {
    public $brand = "Toyota";
}
$myCar = new Car();
echo $myCar->brand;

Example

<?php
// 1. String
$name = "Alice";
echo "String: $name<br>";   // Output: Alice

// 2. Integer
$age = 30;
echo "Integer: $age<br>";   // Output: 30

// 3. Float
$price = 99.99;
echo "Float: $price<br>";   // Output: 99.99

// 4. Boolean
$isAdmin = true;
echo "Boolean: " . ($isAdmin ? 'true' : 'false') . "<br>"; // Output: true

// 5. Array
$colors = ["Red", "Green", "Blue"];
echo "Array: " . $colors[0] . "<br>";   // Output: Red

// 6. Object
class Car {
    public $brand = "Toyota";
}
$car = new Car();
echo "Object: " . $car->brand . "<br>";  // Output: Toyota

// 7. NULL
$data = null;
echo "NULL: ";
var_dump($data);  // Output: NULL
?>
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