Why does the autoloader.php file know that $className represents test

Question

function __autoload($className)

{

$path = $className.'.php'; //test.php

if (file_exists($path )) {

require_once($path);

}else {

echo $path."Does not exist, please check~~";

}

}

Answer 1

autoload() is an automatic loading function. $className in Chinese means class name, and $className is a variable. The value you pass is xxxx.php