Defining the document root directory as the ROOT_PATH
问题 I use some constants to define paths to specific directories on a website that I'm building, like this: define("ROOT_PATH", "http://website.com/"); define("IMAGES_DIR", ROOT_PATH . "images/"); and I usually use them like this: echo "<img src='" . IMAGES_DIR . "some_image.jpg' />"; now I want to know if there is any difference between define("ROOT_PATH", "http://website.com/"); and define("ROOT_PATH", "/home/username/public_html/"); and which one of them should I use? And why? 回答1: You can't