<code><?phpclass father{ public function __construct() { $this->init(); } private function init() { echo "father\n"; }}class son extends father{ public function init() { echo "son\n"; }}$son = new son();</code>
回复内容:
<code><?phpclass father{ public function __construct() { $this->init(); } private function init() { echo "father\n"; }}class son extends father{ public function init() { echo "son\n"; }}$son = new son();</code>
因为son里的init方法是public,而father的init方法是private,这个其实表示你son里的init方法并没有重写父类里的方法。那自然调用的仍然是父类自己的实现了
<code>$son.init(); // son</code>
<code>php</code><code><br>class father{ public function __construct() { // $this->init(); static::init();//php5.6 } private function init() { echo "father\n"; }}class son extends father{ /*public function __construct() { $this->init(); }*/ public function init() { echo "son\n"; }}</code>
后期静态绑定
Reference: http://docs.php.net/manual/en/language.oop5.late-static-bindings.php
Note:
In non-static contexts, the called class will be the class of the object instance. Since$this->
will try to call private methods from the same scope, using static:: may give different results. Another difference is that static:: can only refer to static properties.
<code>class father{ public function __construct() { $this->init(); } private function init() { echo "father\n"; }}class son extends father{ public fun<a style="color:transparent">来@源gao*daima.com搞@代#码网</a><strong>搞gaodaima代码</strong>ction __construct() { parent::__construct(); $this->init(); } private function init() { echo "son\n"; }}new son();</code>
输出
<code>fatherson</code>
建议查看__construct基础知识,想告诉楼主踏实一点,我就不信你弄清了里面的方法还会来问
授之以渔
private方法无法被重写
father中的init如果是public或protected,那么是会输出son;但是现在是private,所以在father中调用init是不会输出son的,而是调father的int输出father。