spl_autoload_register() 延迟加载

<?php
/*
(PHP 5 >= 5.1.2, PHP 7)
php延迟加载
*/
function my_load($class)
{
require($class.'.php');
}

spl_autoload_register('my_load');

$is_girl=$_GET['sex'] == 0 ? true : false;
if($is_girl)
{

echo '<h1>this is a girl</h1>';
$test1 = new Test1;

}else{

echo '<h1>this is a boy</h1>';

$test2 = new Test2;

}

?>