<?php function __autoload($classname) { $filename = str_replace("_", DIRECTORY_SEPARATOR, $classname) . '.php'; include $filename; if (!file_exists($filename)) { return false; } } $textInput = new Text_Input(); $memoryReader = new Memory_Reader(); $fileReader = new File_Reader(); echo $textInput->toString(), "<br/>"; echo $memoryReader->toString(), "<br/>"; echo $fileReader->toString();