PHP开发经典教程 (Part7):面向对象编程

<?php
// PHP 5
// class definition 
class Bear {
// define properties 
    public $name;
public $weight;
public $age;
public $sex;
public $colour;
// constructor 
    public function __construct() {
$this->age = 0;
$this->weight = 100;
$this->colour = "brown";
}
// destructor 
    public function __destruct() {
echo $this->name." is dead. He was ".$this->age." 
years old and ".$this->weight." units heavy. Rest in peace! ";
}
// define methods 
    public function eat($units) {
echo $this->name." is eating ".$units." units of food... ";
$this->weight += $units;
}
public function run() {
echo $this->name." is running... ";
}
public function kill() {
echo $this->name." is killing prey... ";
}
}
// create instance of Bear() 
$daddy = new Bear;
$daddy->name = "Daddy Bear";
$daddy->age = 10;
$daddy->kill();
$daddy->eat(2000);
$daddy->run();
$daddy->eat(100);
?>

Daddy Bear is killing prey...
Daddy Bear is eating 2000 units of food...
Daddy Bear is running...
Daddy Bear is eating 100 units of food...
Daddy Bear is dead. He was 10 years old and 2200 units heavy. Rest in peace!