[php]<?php
class a{

var $test ="hello world";

function output1($test){
echo $this->test;
}

function output2($test){
echo $test;
}
}

$t = new a();
$t ->output1("dd");
$t ->output2("dd");[/php]

代码很简单，是php4.x的，不过一直困惑它们的输出