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<?php
/*
================ MAGIC METHODS AND CONSTANTS ================
When we create a new object, and the constructor method requires a parameter, and we run it without passing one, we risk breaking the code.

Assigning default values will solve this problem.
*/

class Car {
	private $model ;
	
	// default value if no value is passed when a new object is created
	public function __construct ( $model = null ) {
		if ( $model ) {
			$this->model = $model ;
		}
	}
	
	public function getCarModel() {
		return 'Car model is: ' . $this->model;
	}
	
	public function getObjectInfo() {
		return 'The Class Name: ' . __CLASS__ . PHP_EOL . 
		'This line number: ' . __LINE__ . PHP_EOL .
		'The file path: ' . __FILE__ . PHP_EOL .
		'Method name where it is being called: ' . __METHOD__ ;
	}
	
}

$car = new Car(); // no value was passed, model will print null (empty string)
echo $car->getCarModel() ;
echo PHP_EOL;
echo $car->getObjectInfo() ;

echo PHP_EOL;

class User {
	
	private $firstName;
	private $lastName;
	
	public function __construct( $firstName = 'Toto', $lastName = NULL) {
		if ( $firstName ) {
			$this->firstName = $firstName ;
		}
		
		if ( $lastName ) {
			$this->lastName = $lastName ;
		}
	}
	
	public function getFullName() {
		return $this->firstName . ' ' . $this->lastName;
	}
}


$user1 = new User('John', 'Rambo') ;
$user2 = new User() ;
$user3 = new User('Bananero') ;

echo $user1->getFullName() . PHP_EOL ;
echo $user2->getFullName() . PHP_EOL ;
echo $user3->getFullName() . PHP_EOL ;