Web Technologies

PHP Data Types

Smt.M.Jeevana Sujitha

Assistant Professor

​

Department of Computer Science and Engineering

SRKR Engineering College, Bhimavaram, A.P. - 534204

OBJECTIVES

The Objectives of this lecture are

• To learn about PHP data types.

PHP Data Types

Data Type:

• It represents the nature of data.
• PHP supports the following data types.
• String
• Integer
• Float (floating point numbers - also called double)
• Boolean
• Array
• Object
• NULL
• Resource

PHP Data Types

String:

• A string is a collection of characters.
• A string can be any text inside quotes. Example:

<?php

$x = "Hello world!";

$y = 'Hello world!'; echo $x;

echo "<br>"; echo $y;

?>

PHP Data Types

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 Data Types

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 Data Types

PHP Boolean:

• A Boolean represents two possible states: TRUE or FALSE.
• Booleans are often used in conditional testing.

Example:

<?php

$x = true;

$y = false;

?>

PHP Data Types

PHP Array:

• An array stores multiple values in one single variable.

Example:

<?php

$cars = array("Volvo","BMW","Toyota"); var_dump($cars);

?>

PHP Data Types

PHP Object:

• An object is a data type which stores data and information on how to process that data.
• In PHP, an object must be explicitly declared.
• First we must declare a class of object.
• For this, we use the class keyword.
• A class is a structure that can contain properties and methods:

PHP Data Types

PHP Null:

• 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.
• If a variable is created without a value, it is automatically assigned a value of NULL.

Example:

<?php

$x = "Hello world!";

$x = null; var_dump($x);

?>

PHP Data Types

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.

THANK YOU