{"id":148,"title":"\u7ee7\u627f","good":0,"bad":0,"hit":2624,"created_at":"2015-01-12 15:33:03","content":"<p>\u5b9a\u4e49<\/p><p>\u7ee7\u627f\uff1a\u5982\u679c\u4e00\u4e2a\u5bf9\u8c61A\uff0c\u4f7f\u7528\u4e86\u53e6\u4e00\u4e2a\u5bf9\u8c61B\u7684\u6210\u5458\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u79f0A\u5bf9\u8c61\u7ee7\u627f\u4e86B\u5bf9\u8c61\uff01\u6b64\u65f6B\u79f0\u4e3aA\u7684\u57fa\u7c7b\u6216\u8005\u7236\u7c7b\uff0cA\u79f0\u4e3aB\u7684\u6269\u5c55\u7c7b\u6216\u8005\u5b50\u7c7b\uff1b<br\/><\/p><p>&nbsp;<\/p><p>\u8bed\u6cd5<\/p><p>\u4f7f\u7528\u5173\u952e\u5b57 extends \u8ba9\u4e00\u4e2a\u7c7b\u7ee7\u627f\u81ea\u53e6\u4e00\u4e2a\u7c7b\uff01<\/p><p><\/p><p>\u5355\u7ee7\u627f <br\/><\/p><p>\u6307\u7684\u662f\uff0c\u4e00\u4e2a\u7c7b\uff0c\u53ea\u80fd\u5b58\u5728\u4e00\u4e2a\u7236\u7c7b\uff08\u57fa\u7840\u7c7b\uff09\uff0c\u4e0d\u80fd\u540c\u65f6\u7ee7\u627f\u591a\u4e2a\u7c7b\uff01\u5982\u679cA\u7c7b\u60f3\u7ee7\u627fB\u7c7bC\u7c7b\uff0c\u5219\u53ef\u4ee5\u8ba9B\u5148\u7ee7\u627fC\uff0cA\u518d\u7ee7\u627fB\uff1b<\/p><p><br\/><\/p><p><strong>\u4f8b\u5b50\uff1a<\/strong><br\/><\/p><p>&lt;?php<br\/>class A{<br\/>&nbsp;&nbsp; &nbsp;public function f1(){<br\/>&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;echo 1;<br\/>&nbsp;&nbsp; &nbsp;}<br\/>}<br\/>class B extends A{<br\/>&nbsp;&nbsp; &nbsp;public function f2(){<br\/>&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;echo 2;<br\/>&nbsp;&nbsp; &nbsp;}<br\/>}<br\/>class C extends B{<br\/>&nbsp;&nbsp; &nbsp;public function f3(){<br\/>&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;echo 3;<br\/>&nbsp;&nbsp; &nbsp;}<br\/>}<br\/>$o=new C();<br\/>$o-&gt;f1();\/\/1<br\/>$o-&gt;f2();\/\/2<br\/>$o-&gt;f3();\/\/3<br\/>\/\/instanceof \u68c0\u67e5\u67d0\u4e2a\u5bf9\u8c61\u662f\u5426\u4e3a\u67d0\u4e2a\u5bf9\u8c61\u7684\u5b9e\u4f8b<br\/>var_dump($o instanceof C);\/\/true<br\/>var_dump($o instanceof B);\/\/true<br\/>var_dump($o instanceof A);\/\/true<br\/>?&gt;<br\/><\/p><p><br\/><\/p>"}