<?php 
// 類的定義 
class User 
{ 
// 屬性,注意public、private、protected的作用范圍 
public $name = "hackbaby"; 
// 構造函數(shù) 
function __construct() 
{ 
echo "construct<br />"; 
} 
// 方法 
function say() 
{ 
echo "這是在類的本身調用：$this->name"; 
} 
// 析構函數(shù) 
function __destruct() 
{ 
echo "destruct"; 
} 
// 返回當前對象的描述信息 通過實例化的變量名調用例如本例中的$user 
function __toString() 
{ 
return "user class"; 
} 
} 
//實例化，如果構造函數(shù)有參數(shù)則用$user = new User('參數(shù)'); 
$user = new User(); 
echo $user->name . "<hr />"; 
$user->say(); 
echo "<hr />"; 
echo $user; 
?> 

例二：

復制代碼代碼如下:

<?php 
class Fruit 
{ 
protected $fruit_color; 
protected $fruit_size; 

function setcolor($color) 
{ 
$this->fruit_color = $color; 
} 

function getcolor() 
{ 
return $this->fruit_color; 
} 

function setsize($size) 
{ 
$this->fruit_size = $size; 
} 

function getsize() 
{ 
return $this->fruit_size; 
} 

function save() 
{ 
//代碼 
} 
} 
class apple extends Fruit 
{ 
private $variety; 

function setvariety($type) 
{ 
$this->variety = $type; 
} 

function getvariety() 
{ 
return $this->variety; 
} 
} 
$apple = new apple(); 
echo $apple->setvariety('紅富士'); 
echo $apple->getvariety(); 
echo "<br />"; 
echo $apple->setcolor('red'); 
echo $apple->getcolor(); 
echo "<br />"; 
echo $apple->setsize('特大'); 
echo $apple->getsize(); 

?>