<?php
class B_
{
private $a; //定义私有$a
function cout()
{
$this->a=new A_(); //$this->a//也就是$a对象=A_类
$this->a->main1(); //调用A_类的main1()函数
}
}
class A_
{
function main1()
{
echo “mail1”;
}
}
$b=new B_(); //实例B_类
$b->cout(); //调用B_类的cout函数
?>