<?php
class BBB{
private $name;
function __construct($name){
$this->name = $name;
}
function hello() {
echo $this->name;
}
}
?>编写测试用php文件，保存为AAA.php，内容如下：
<?php
require_once 'BBB.php';
if(class_exists('BBB')){
$bbb = new BBB('张三');
$bbb->hello();
echo "<br>";
$class = BBB;
$bbb = new $class('李四');
$bbb->hello();
echo "<br>";
$class = 'BBB';
$bbb = new $class('王五');
$bbb->hello();
}
?>通过浏览器访问AAA.php，输出结果如下：
张三<br>李四<br>王五