PHP Data Types

PHP Data Types

Variables can store data of different types, and different data types can do different things.

PHP supports the following data types:

• String
• Integer
• Float (floating point numbers - also called double)
• Boolean
• Array
• Object
• NULL
• Resource

PHP String

A string is a sequence of characters, like "Hello world!".

A string can be any text inside quotes. You can use single or double quotes:

Example

<?php
$x = "Hello world!";
$y = 'Hello world!';

echo $x;
echo "<br>";
echo $y;
?>

PHP Integer

An integer data type is a non-decimal number between -2,147,483,648 and 2,147,483,647.

Rules for integers:

• An integer must have at least one digit
• An integer must not have a decimal point
• An integer can be either positive or negative
• Integers can be specified in: decimal (base 10), hexadecimal (base 16), octal (base 8), or binary (base 2) notation

Example

<?php
$x = 5985;
var_dump($x);
?>

PHP Float

A float (floating point number) is a number with a decimal point or a number in exponential form.

Example

<?php
$x = 10.365;
var_dump($x);
?>

PHP Boolean

A Boolean represents two possible states: TRUE or FALSE.

Example:

$x = true;
$y = false;

PHP Array

Example

<?php
$cars = array("Volvo","BMW","Toyota");
var_dump($cars);
?>

PHP Object

Example

<?php
class Car {
    function Car() {
        $this->model = "VW";
    }
}

// create an object$herbie = new Car();

// show object propertiesecho $herbie->model;
?>

PHP NULL Value

Example

<?php
$x = "Hello world!";
$x = null;
var_dump($x);
?>