class Foo {
public static function foobar() {
self::whereami();
}
protected static function whereami() {
echo 'foo';
}
}
class Bar extends Foo {
protected static function whereami() {
echo 'bar';
}
}
Foo::foobar();
Bar::foobar();
expected foobar
actual result foofoo
更糟糕的是,服务器被限制为php 5.2
发布于 2011-05-02 14:30:05
尝试使用单例模式:
<?php
class Foo {
private static $_Instance = null;
private function __construct() {}
private function __clone() {}
public static function getInstance() {
if(self::$_Instance == null) {
self::$_Instance = new self();
}
return self::$_Instance;
}
public function foobar() {
$this->whereami();
}
protected function whereami() {
print_r('foo');
}
}
class Bar extends Foo {
private static $_Instance = null;
private function __construct() {}
private function __clone() {}
public static function getInstance() {
if(self::$_Instance == null) {
self::$_Instance = new self();
}
return self::$_Instance;
}
protected function whereami() {
echo 'bar';
}
}
Foo::getInstance()->foobar();
Bar::getInstance()->foobar();
?>
发布于 2011-05-02 12:04:37
难道你不需要重写父函数foobar()吗?
class Foo {
public static function foobar() {
self::whereami();
}
protected static function whereami() {
echo 'foo';
}
}
class Bar extends Foo {
public static function foobar() {
self::whereami();
}
protected static function whereami() {
echo 'bar';
}
}
Foo::foobar();
Bar::foobar();
https://stackoverflow.com/questions/5853310
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