Register in PHP_ Globals parameter settings

register_globals yes php.ini A configuration in , This configuration affects php How to receive passed parameters .

1、 When register_globals=Off When , The next program should use $_GET['user_name'] and $_GET['user_pass'] To accept the value passed in .（ notes ： When <form> Of method The attribute is post You should use $_POST['user_name'] and $_POST['user_pass']）

2、 When register_globals=On When , The next program can be used directly $user_name and $user_pass To accept values .

seeing the name of a thing one thinks of its function ,register_globals To register as a global variable , So when On When , The values passed in will be directly registered as global variables and used directly , and Off When , We need to go into a specific array to get it .

register_globals= Off The situation of not only affects how to get from <form>、url Data passed in , It also affects session、cookie, Corresponding , obtain session、cookie The way to do it should be ：$_SESSION[]、$_COOKIE. At the same time session There are also some changes in the processing of , Therefore, it is generally set to Off.