<?php
class MyObj
{
public static $instance = 0;
public function myMethod()
{
self::$instance += 2;
echo self::$instance . '<br/>';
}
}
class MyOtherObj extends MyObj
{
public static $instance = 0;
public function myOtherMethod()
{
echo parent::$instance . '<br/>';
// parent 指代父类
echo self::$instance . '<br/>';
// self 表示本身类
}
}
$instance1 = new MyObj();
$instance1->myMethod();
// 2
$instance2 = new MyObj();
$instance2->myMethod();
// 4
$instance3 = new MyOtherObj();
$instance3->myOtherMethod();
// 4,0
public static $myStaticVar = 0;
function myMethod()
{
self::$myStaticVar += 2;
echo self::$myStaticVar . '<br/>';
}
}
$instance1 = new MyObject();
$instance1->myMethod();
$instance2 = new MyObject();
$instance2->myMethod();
echo '<hr/>';
class MyObj
{
function myBaseMethod()
{
echo "I am declared in MyObject<br/>";
}
}
class MyOtherObj extends MyObj
{
function myExtendedMethod()
{
echo 'myExtendedMethod id declared in MyOtherObj <br/>';
self::myBaseMethod();
// 在这里 self 和 parent 作用一样
//parent::myBaseMethod();
}
}
MyOtherObj::myExtendedMethod();
