__autoload
__autoload() was the name of the userland function, used to load classes when they were not found yet in the current execution environment.
__autoload() was later replaced with spl_autoload_register(), which allows the composition of multiple autoloading methods.
<?php
function __autoload($name) {
if (file_exists(classes/$name.php)) {
include classes/$name.php;
}
}
?>