<?php 
class    A 
{ 
         // 属性(成员)声明 
         public $aa = 'A缺省值'; 
         public $bb=array( "苹果", "葡萄", "香蕉"); 
 
         // 方法声明 
         public function echo_aa() { 
                echo $ this->aa; //not $this->$aa 
        } 
} 
?>

<?php 
class    B 
{ 
         // 属性(成员)声明 
         public $aa = 'B缺省值'; 
         public $bb=array( "苹果", "葡萄", "香蕉"); 
 
         // 方法声明 
         public function echo_aa() { 
                echo $ this->aa; //not $this->$aa 
        } 
} 
?>

<?php 
include  "class_A.php"; 
include  "class_B.php"; 
 
$a= new A; 
$a->echo_aa(); 
 
$b= new B; 
$b->echo_aa(); 
?>

<?php 
function __autoload($class_name) { 
        require_once  "class_".$class_name . '.php'; 
} 
 
$a= new A; 
$a->echo_aa(); 
 
$b= new B; 
$b->echo_aa(); 
?>