PHP Tutorial
- PHP Tutorial
- Install PHP
- PHP Code
- PHP Echo and print
- PHP Variable
- PHP Variable Scope
- PHP $ and $$
- PHP Constants
- PHP Data Types
- PHP Operators
- PHP Comments
Control Statement
- PHP If else
- PHP Switch
- PHP For Loop
- PHP foreach loop
- PHP While Loop
- PHP Do While Loop
- PHP Break
- PHP Continue
PHP Functions
- PHP Functions
- Parameterized Function
- PHP Call By Value and reference
- PHP Default Arguments
- PHP Variable Arguments
- PHP Recursive Function
PHP Arrays
PHP Strings
PHP Math
PHP Form
PHP Include
State Management
PHP File
Upload Download
PHP OOPs Concepts
- OOPs Concepts
- OOPs Abstract Class
- OOPs Abstraction
- OOPs Access Specifiers
- OOPs Const Keyword
- OOPs Constructor and destructor
- Encapsulation
- Final Keyword
- OOPs Functions
- OOPs Inheritance
- OOPs Interface
- OOPs Overloading
- OOPs Type Hinting
PHP MySQLi
- MySQLi CONNECT
- MySQLi CREATE DB
- MySQLi CREATE Table
- MySQLi INSERT
- MySQLi UPDATE
- MySQLi DELETE
- MySQLi SELECT
- MySQLi Order by
PHP Topics
- Compound Types
- is_null() Function
- Special Types
- Inheritance Task
- Special Types
- MVC Architecture
- PHP vs. JavaScript
- PHP vs. HTML
- PHP vs. Node.js
- PHP vs Python
- PHP PDO
- Top 10 PHP frameworks
- phpMyAdmin
- Count All Array Elements
- Create Newline
- Get Current Page URL
PHP Mail
PHP data types are used to hold different types of data or values. PHP supports 8 primitive data types that can be categorized further in 3 types:
- Scalar Types (predefined)
- Compound Types (user-defined)
- Special Types
PHP Data Types: Scalar Types
It holds only single value. There are 4 scalar data types in PHP.
- boolean
- integer
- float
- string
PHP Data Types: Compound Types
It can hold multiple values. There are 2 compound data types in PHP.
- array
- object
PHP Data Types: Special Types
There are 2 special data types in PHP.
- resource
- NULL
PHP Boolean
Booleans are the simplest data type works like switch. It holds only two values: TRUE (1) or FALSE (0). It is often used with conditional statements. If the condition is correct, it returns TRUE otherwise FALSE.
Example:
<?php
if (TRUE)
echo "This condition is TRUE.";
if (FALSE)
echo "This condition is FALSE.";
?>
Output:
This condition is TRUE.
PHP Integer
Integer means numeric data with a negative or positive sign. It holds only whole numbers, i.e., numbers without fractional part or decimal points.
Rules for integer:
- An integer can be either positive or negative.
- An integer must not contain decimal point.
- Integer can be decimal (base 10), octal (base 8), or hexadecimal (base 16).
- The range of an integer must be lie between 2,147,483,648 and 2,147,483,647 i.e., -2^31 to 2^31.
Example:
<?php
$dec1 = 34;
$oct1 = 0243;
$hexa1 = 0x45;
echo "Decimal number: " .$dec1. "</br>";
echo "Octal number: " .$oct1. "</br>";
echo "HexaDecimal number: " .$hexa1. "</br>";
?>
Output:
Decimal number: 34 Octal number: 163 HexaDecimal number: 69
PHP Float
A floating-point number is a number with a decimal point. Unlike integer, it can hold numbers with a fractional or decimal point, including a negative or positive sign.
Example:
<?php
$n1 = 19.34;
$n2 = 54.472;
$sum = $n1 + $n2;
echo "Addition of floating numbers: " .$sum;
?>
Output:
Addition of floating numbers: 73.812
PHP String
A string is a non-numeric data type. It holds letters or any alphabets, numbers, and even special characters.
String values must be enclosed either within single quotes or in double quotes. But both are treated differently. To clarify this, see the example below:
Example:
<?php
$company = "Javatpoint";
//both single and double quote statements will treat different
echo "Hello $company";
echo "</br>";
echo 'Hello $company';
?>
Output:
Hello Javatpoint Hello $company
PHP Array
An array is a compound data type. It can store multiple values of same data type in a single variable.
Example:
<?php
$bikes = array ("Royal Enfield", "Yamaha", "KTM");
var_dump($bikes); //the var_dump() function returns the datatype and values
echo "</br>";
echo "Array Element1: $bikes[0] </br>";
echo "Array Element2: $bikes[1] </br>";
echo "Array Element3: $bikes[2] </br>";
?>
Output:
array(3) { [0]=> string(13) "Royal Enfield" [1]=> string(6) "Yamaha" [2]=> string(3) "KTM" } Array Element1: Royal Enfield Array Element2: Yamaha Array Element3: KTM
You will learn more about array in later chapters of this tutorial.
PHP object
Objects are the instances of user-defined classes that can store both values and functions. They must be explicitly declared.
Example:
<?php
class bike {
function model() {
$model_name = "Royal Enfield";
echo "Bike Model: " .$model_name;
}
}
$obj = new bike();
$obj -> model();
?>
Output:
Bike Model: Royal Enfield
This is an advanced topic of PHP, which we will discuss later in detail.
PHP Resource
Resources are not the exact data type in PHP. Basically, these are used to store some function calls or references to external PHP resources. For example – a database call. It is an external resource.
This is an advanced topic of PHP, so we will discuss it later in detail with examples.
PHP Null
Null is a special data type that has only one value: NULL. There is a convention of writing it in capital letters as it is case sensitive.
The special type of data type NULL defined a variable with no value.
Example:
<?php
$nl = NULL;
echo $nl; //it will not give any output
?>
Output: