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
• ResourcePHP 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:

<?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 of integer:

• 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.In the following example $x is an integer. The PHP var_dump() function returns the data type and value:

<?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.
In the following example $x is a float. The PHP var_dump() function returns the data type and value

<?php$x = 10.365;var_dump($x);?>

PHP Boolean:
A Boolean represents two possible states: TRUE or FALSE.
Booleans are often used in conditional testing. You will learn more about conditional testing in a later chapter of this tutorial.

$x = true;$y = false;

PHP Array:
An array stores multiple values in one single variable.

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

PHP Object:
Classes and objects are the two main aspects of object-oriented programming.
A class is a template for objects, and an object is an instance of a class.
When the individual objects are created, they inherit all the properties and behaviors from the class, but each object will have different values for the properties.

class Car {  public $color;  public $model;  public function __construct($color, $model) {    $this->color = $color;    $this->model = $model;  }  public function message() {    return "My car is a " . $this->color . " " . $this->model . "!";  }}$myCar = new Car("black", "Volvo");echo $myCar -> message();echo "<br>";$myCar = new Car("red", "Toyota");echo $myCar -> message();

PHP NULL Value:
Null is a special data type which can have only one value: NULL.
A variable of data type NULL is a variable that has no value assigned to it.

$x = "Hello world!";$x = null;var_dump($x);

PHP Resource:
The special resource type is not an actual data type. It is the storing of a reference to functions and resources external to PHP.
A common example of using the resource data type is a database call.