Lets write a class named "CAR"
PHP Class (car.inc.php)
class Car{
//Properties
private $name;
private $bodyColor;
private $year;
public static $NoOfTyres = 4;
public function __construct($name,$bodyColor,$year){
$this->name= $name;
$this->bodyColor = $bodyColor;
$this->year = $year;
}
//Methods
public function setName($name){
$this->name = $name;
}
public function getName(){
return $this->name;
}
public function getbodyColor(){
return $this->bodyColor;
}
public function getYear(){
return $this->year;
}
public static function setNoOfTyres($newNoTyres){
self::$NoOfTyres = $newNoTyres;
}
}
In the above class we have a constructor, we look at the constructor and go 'hm this car-constructor got three parameters name, bodyColor and year'. So we create the object in the index.php file, in this case - 'tesla' and pass three parameters (modelx,black,2019) . then to access them we create methods like getName, getYear and getbodyColor and in each method we return the corresponding variable. This is because the private variables/properties cannot be accessed directly .
We replace X with each property or variable.
public function getX(){
return $this->x;
}
We have written a method 'setName()' which allows us to change the name of an instantiated class.
By writing following
$tesla = new Car("Modelx","black","2019");
We passed "modelx" as the name but if we decide to change it we can do the following
$tesla->setName("ModelY");
And it would change.
Whats up with the 'static' keyword?
The static keyword can be used for cases like 'the No Of tyres in a car'. No Of tyres in a car would not change and to access the static property No Of Tyres in the above class we can echo out like so;
echo Car::$NoOfTyres;
But down the line, say someone wanted 6 tyres in the car, so to change the static property we write another method like so
public static function setNoOfTyres($newNoTyres){
self::$NoOfTyres = $newNoTyres;
}
then to use it we can do
Car::setNoOfTyres(6);
Then echo it out to find if it actually changed.
Index.php would look like this
<?php
include 'includes/car.inc.php';
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<?php
$tesla = new Car("Modelx","black","2019");
echo $tesla->getName();
echo "<br>";
echo $tesla->getbodyColor();
echo "<br>";
echo $tesla->getYear();
$tesla->setName("ModelY");
echo "<br>";
echo "<br>";
echo $tesla->getName();
echo "<br>" ;
echo Car::$NoOfTyres;
Car::setNoOfTyres(6);
echo "<br>";
echo Car::$NoOfTyres;
?>
</body>
</html>
I have explained this in a video, see if it will help :)
Link to the video: https://youtu.be/f9jay4Ios-4
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