<!-- 声明一个员工类,经理类继承自员工类 --> 
<? 
class employee{ 
 protected $sal=3000;  
 public function getSal(){ 
 $this->sal = $this->sal + 1200; 
 return $this->sal ; 
 } 
} 
 
class Manager extends employee { 
 //如果想让经理在员工工资的基础上多发1500元. 
 //必须先调用父类的getSal()方法. 
 public function getSal(){  
 parent::getSal();// 这里调用了父类的方法. 
 $this->sal = $this->sal + 1500; 
 return $this->sal ; 
 } 
} 
$emp = new employee(); 
echo "普通员工的工资是 " . $emp->getSal(); 
echo "<br>"; 
//xiariboke.com 
$manager = new Manager(); 
echo "经理的工资是: " . $manager->getSal(); 
?> 

<?php 
class employee{ 
 private $sal=3000; 
 //protected $sal=3000; 
 public function getSal(){  
 return $this->sal; 
 }  
} 
 
class Manager extends employee { 
 protected $sal=5000; 
 
 public function getParentSal(){ 
 //这里返回的是父类的private属性. 
 return parent::getSal(); 
 } 
} 
$manager = new Manager(); 
echo "PHP ".phpversion()."<br>"; 
echo $manager->getSal(); 
echo "<br>"; 
echo "parent's \$sal ".$manager->getParentSal(); 
//xiariboke.com 
?> 

<?php 
class employee{ 
 //private $sal=3000; 
 protected $sal=3000; 
 public function getSal(){  
 return $this->sal; 
 }  
} 
 
class Manager extends employee { 
 protected $sal=5000; 
 //xiariboke.com 
 public function getParentSal(){ 
 //这里返回的是父类的private属性. 
 return parent::getSal(); 
 } 
} 
$manager = new Manager(); 
echo "PHP ".phpversion()."<br>"; 
echo $manager->getSal(); 
echo "<br>"; 
echo "parent's \$sal ".$manager->getParentSal(); 
 
?> 

<?php 
class employee{ 
 private $sal=3000; 
 public function getSal(){  
 return $this->sal; 
 } 
} 
 
class Manager extends employee { 
 private $sal=5000; 
 //重写过的方法 
 public function getSal(){  
 return $this->sal; 
 }  
 public function getParentSal(){ 
 //这里返回的是父类的private属性. 
 return parent::getSal(); 
 } 
} 
$manager = new Manager(); 
echo "PHP ".phpversion()."<br>"; 
echo $manager->getSal(); 
echo "<br>"; 
echo "parent's \$sal ".$manager->getParentSal(); 
 
?> 

<?php 
class employee{ 
 private $sal=3000; 
 public function getSal(){  
 return $this->sal; 
 }  
} 
class Manager extends employee { 
 protected $sal=5000; 
 public function getParentSal(){ 
 return $this->sal; 
 } 
} 
$manager = new Manager(); 
echo "PHP ".phpversion()."<br>"; 
echo $manager->getSal(); 
 
?> 

<?php 
class employee{ 
 protected $sal=3000; 
 public function getSal(){  
 return $this->sal; 
 }  
} 
class Manager extends employee { 
 protected $sal=5000; 
 public function getParentSal(){ 
 return $this->sal; 
 } 
} 
$manager = new Manager(); 
echo "PHP ".phpversion()."<br>"; 
echo $manager->getSal(); 
 
?> 

<?php 
class employee{ 
 private $sal=3000; 
 public function getSal(){  
 return parent::$this->sal; 
 }  
} 
 
class Manager extends employee { 
 protected $sal=5000; 
 public function getSal(){  
 return parent::$this->getSal(); 
 } 
} 
$manager = new Manager(); 
echo "PHP ".phpversion()."<br>"; 
echo $manager->getSal(); 
 
?>