date_default_timezone_set("PRC");
/**
* 重写和Final
* 1. 子类中编写跟父类完全一致的方法可以完成对父类方法的重写
* 2. 对于不想被任何类继承的类可以在class之前添加final关键字
* 3. 对于不想被子类重写（overwrite, 修改）的方法，可以在方法定义前面添加final关键字
*/
class BaseClass
{
public function test()
{
echo "BaseClass::test() called\n";
}
public function moreTesting()
{
echo "BaseClass::moreTesting() called\n";
}
}
class ChildClass extends BaseClass
{
// 重写时参数不一定要跟父类完全一致
public function moreTesting($tmp = null)
{
echo "ChildClass::moreTesting() called\n";
}
}
// Results in Fatal error: Cannot override final method BaseClass::moreTesting()
$obj = new ChildClass();
$obj->moreTesting();
<?php
class BaseClass
{
public function test()
{
echo "BaseClass::test() called<br>";
}
public final function moreTesting()
{
echo "BaseClass::moreTesting() called<br>";
}
}
class ChildClass extends BaseClass
{
public function test()
{
echo "ChildClass::test() called<br>";
}
}
$ins = new ChildClass();
echo $ins->test() . '<br >';
echo $ins->moreTesting();
