【单选题】执行以下代码,输入结果是( )。 class A{ function __construct(){ echo "echo class a something"; } } class B extends A{ function __construct(){ echo "echo class b something"; } } $a=new B();
【简答题】执行以下代码,输出结果是()? class a{ function __construct(){ echo "echo class a something"; }}class b extends a{ function __construct(){ echo "echo class b something"; }}$a = new b();?A....