Object mobil dengan PHP

kali ini saya akan membuat contoh pembuatan object mobil.
object mobil punya identitas warna, merek dan type.
object mobil juga dilengkapi fungsi injek_gas untuk menambah kecapatan, dan injek_rem untuk mengurangi kecepatan, dan fungsi kencengnya untuk mengetahui kecepatan.
melalui kode ini diharapkan teman2 yang ingin belajar OOP di PHP bisa melihat contoh sederhana penggunaan OOP.
langsung ke codenya

<?php
class mobil {
	public $warna;
	public $merek;
	public $model;
	private $_kenceng = 0;
	public function injekGas() {
		if ( $this->_kenceng >= 120 ) return false;
		$this->_kenceng += 10;
		return true;
	}
	public function injekRem() {
		if ( $this->_kenceng <= 0 ) return false;
		$this->_kenceng -= 10;
		return true;
	}
	public function kencengnya() {
		return $this->_kenceng;
	}
}
$myCar = new mobil();
$myCar->warna = "merah";
$myCar->merek = "Toyota";
$myCar->model = "kijang";
echo "<p> aku mengendarai sebuah $myCar->merek $myCar->model berwarna $myCar->color.</p>";
echo "<p>kalo pedal gas di injek...<br />";
while ( $myCar->injekGas() ) {
	echo "kecepatan sekarang: ". $myCar->kencengnya() . "kmpj<br />";
}
echo "</p><p>kecepatan mentok! sekarang injek rem untuk menguragi kecepatan...<br />";
while ( $myCar->injekRem() ) {
	echo "kecepatan sekarang: ". $myCar->kencengnya() . "kmpj<br />";
}
echo "</p><p> berenti dah !</p>";
?>

keterangan:
kode aslinya ada di buku beginning PHP 5.3 penulisnya matt doyle.

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