History of PHP :
 |
| Rasmus Lerdorf |
PHP is used for building e-commerce web applications, dynamic content, databases and sites.PHP is integrated with many popular databases that allow you to create and manage all types of dynamic web applications, including MySQL, PostgreSQL, Oracle, Sybase, Informix and Microsoft SQL Server. MySQL servers are one of the more preferred databases that, once launched, also perform very complex queries with a heavy result set in record-setting time.
A large number of major protocols support POP3, IMAP and LDAP in PHP. PHP4 added support for Java to create mobile apps in which complex databases were easily configured and distributed to object architectures (COM and CORBA), creating the potential for n-tier development for the first time.
Released Versions of PHP
| Versions Number | Release Dates |
|---|---|
| PHP 1.0 |
8 June 1995
|
| PHP 2.0 |
1 November 1997
|
| PHP 3.0 |
6 June 1998
|
| PHP 4.0 |
22 May 2000
|
| PHP 4.1 |
10 December 2001
|
| PHP 4.2 |
22 April 2002
|
| PHP 4.3 |
27 December 2002
|
| PHP 4.4 |
11 July 2005
|
| PHP 5.0 |
13 July 2004
|
| PHP 5.1 |
24 November 2005
|
| PHP 5.2 |
2 November 2006
|
| PHP 5.3 |
30 June 2009
|
| PHP 5.4 |
1 March 2012
|
| PHP 5.5 |
20 June 2013
|
| PHP 5.6 |
28 August 2014
|
| PHP 7.0 |
3 December 2015
|
| PHP 7.1 |
1 December 2016
|
| PHP 7.2 |
30 November 2017
|
| PHP 7.3 |
6 December 2018
|
| PHP 7.4 |
28 November 2019
|
| PHP 8.0 |
December 2020
|
PHP Features
- Performance
- Open Source
- Familiarity with syntax
- Embedded
- Platform Independent
- Database Support
- Error Reporting
- Loosely Typed Language
- Web servers Support
- Security
- Control
What is PHP ?
PHP is an open-source, interpreted, and object-oriented and server side scripting language. It is stand for Hypertext Preprocessor (earlier called, Personal Home Page). PHP can be easily embedded in HTML <tag> as it executes on the server-side. It is used to develop Static,Dynamic web applications.
PHP OOPs (Object Oriented Programming System) Concepts
- Class : A class is a prototype from which objects are constructed.A class is a type of class such as a vehicle. If seen, there are many types of vehicles in it. It is made by adding many tools and materials to make it. As soon as classes are created from methods and properties. A class is defined in the program by using the class keyword, and followed by the name of the class and uses curly braces ({}).
<?php
class Vehicle {
// Properties
public $name;
public $color;
// Methods
function set_name($name) {
$this->name = $name;
}
function get_name() {
return $this->name;
}
}
?>
- Object : Object is most important concept of OOps. Defines a class and then constructs all objects under it. Classes without objects do nothing because the object is needed when the class is to run. Which you create using the new keyword. The objects are also known as an example.
<?php
class Fruit {
public $name;
public $color;
function set_name($name) {
$this->name = $name;
}
function get_name() {
return $this->name;
}
}
$apple = new Fruit();
$banana = new Fruit();
$apple->set_name('Apple');
$banana->set_name('Banana');
echo $apple->get_name();
echo "<br>";
echo $banana->get_name();
?>
- Inheritance : It lets subclass inherits characteristics of the parent class. Parent class decides what and the way its properties/methods to be inherited by declared visibility.Re-usability– variety of kids, can inherit from a similar parent. this is often very useful once we need to provide common functionality like adding, updating and deleting data from the database.
<?php
class Vehicle {
public $name;
public function start() {
echo $this->name. " - Engine start...<br/>";
}
public function stop() {
echo $this->name. " - Engine stop...<br/>";
}
}
class Car extends Vehicle {
public function drive() {
echo "I am " . $this->name . "<br/>";
echo "Lets go on a drive...";
}
}
class Motorcycle extends Vehicle {
// motorcycle specific properties
// and methods
}
$car = new Car();
$car->name = "Mercedes benz";
$car->start();
$car->drive();
?>
- Data Abstraction : Abstract is a way to hide and keep information secure. In abstraction, there must be at least one method to be declared shake but not defined. The class that inherits this abstract class needs to define the method that must be an abstract keyword that must be returned before this class for it to be an abstract class. This class cannot be accelerated. Only the class that implements abstract class methods can be instantiated. There may be more than one method that can be left undefined.
<?php
abstract class Animal
{
public $name;
public $age;
public function Describe()
{
return $this->name . ", " . $this->age . " years old";
}
abstract public function Greet();
}
class cat extends Animal
{
public function Greet()
{
return "Lion!";
}
public function Describe()
{
return parent::Describe() . ", and I'm a cat!";
}
}
$animal = new cat();
$animal->name = "Seru";
$animal->age = 5;
echo $animal->Describe();
echo $animal->Greet();
?>
- Polymorphism : This word is can from Greek word poly means "many" and morphism means "property". Polymorphism is of two types, compile time and run time. Method overloading is the same name, but different types of properties and method overriding are the same name defined with the same properties in the parent and child class.
<?php
class Shap
{
function draw(){}
}
class Circle extends Shap
{
function draw()
{
print "Circle has been drawn.</br>";
}
}
class Triangle extends Shap
{
function draw()
{
print "Triangle has been drawn.</br>";
}
}
class Ellipse extends Shap
{
function draw()
{
print "Ellipse has been drawn.";
}
}
$Val=array(2);
$Val[0]=new Circle();
$Val[1]=new Triangle();
$Val[2]=new Ellipse();
for($i=0;$i<3;$i++)
{
$Val[$i]->draw();
}
?>
- Encapsulation : The wrapping up of data methods into is called Encapsulation. It is a fundamental concept in Object-Oriented Programming Language (OOP).
<?php
class PHP {
private $userId;
private $pwd;
public function updatePwd($userId, $pwd) {
echo("Function to update password ''. $pwd . "' for user " . $userId);
echo "<br>";
}
public function courseName($userId) {
echo("Function to check course name of user ". $userId);
echo "<br>";
}
}
$obj = new PHP();
$obj -> updatePwd('PHP12', 'developer54321');
$obj -> courseName('PHP06');
?>
- Constructor : Constructor is special type of function of a class which is automatically executed in PHP programs.
Basic Syntax - Example :
<?php
class MyBaseClass
{
function __construct()
{
echo "I am in MyBaseClass constructor<br/>";
}
}
class OtherClass extends MyBaseClass
{
function __construct()
{
parent::__construct();
echo "OtherClass constructor<br/>";
}
}
class AnotherThirdClass extends MyBaseClass
{
// This will inherit the constructor of MyBaseClass
}
$objct = new MyBaseClass();
$objct = new AnotherClass();
$objct = new AnotherThirdClass();
?>
- Destructor : PHP Destructor is handled by the garbage Collector which always focus over object when there are not any needed of object then it automatically destroyed. The destructor method are going to be called as soon as all references to a specific object are removed or when the item is explicitly destroyed in any order in shutdown sequence.
Basic Syntax - Example :
<?php
class MyDestructableClass
{
function __construct()
{
echo "I am in MyDestructableClass constructor<br/>";
$this->name = "MyDestructableClass";
}
function __destruct()
{
echo "Destroying... ".$this->name."<br/>";
}
}
class OtherClass extends MyDestructableClass
{
function __construct()
{
parent::__construct();
echo " OtherClass constructor<br/>";
}
}
class OtherThirdClass extends MyDestructableClass
{
// This will inherit the constructor of MyDestructableClass class
}
$objct = new MyDestructableClass();
$objct = new AnotherClass();
$objct = new AnotherThirdClass();
echo "<hr/>";
?>
The Best PHP Frameworks for Web Development
- Laravel
- CodeIgniter
- Symfony
- Zend
- Phalcon
- CakePHP
- Yii
- FuelPHP
- PHPixie
- Slim
PHP Best Editor Tools
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