PHP superglobals Summary:
Form 1. $ _ GET // submitted by GET (method = "get") mode, and URL +? Way to pass value
Form data 2. $ _ POST // submitted by method = "post" mode
3. $ _ SERVER // get server information
4 $ _ COOKIE // session one kind of technology, the data stored in the client
5. $ _ SESSION // one kind of session technique, data is stored on the server will
6. $ _ FILE // Get upload file information
7. $ GLOBALS // storage superglobals and global variables, the interior contains $ _GET / $ _POST / $ _COOKIE / $ _ FILE / GLOBALS, attention: $ _ GLOBALS remember playing more than twice globals globals globals $ _GLOBALS $ _GLOBALS
$ _SERVER common variable (note required)
$_COOKIE
Assignment: setcookie ( "cookieNmae", "cookieValue", expiration date);
Value: $ _ COOKIE [ 'cookieName'];
Delete: set the expiration time time () - 999999; minus -1 to delete
$_SESSION
Must open session session session_start () when using session;
1. Delete the destruction of the two-step session unset () 2.session_destroy () delete the session file
session: General storage path D: \ phpstudy \ myphp_www \ PHPTutorial \ tmp \ tmp (phpstudy Environment)
$_GLOBALS
$ _GLOBALS store global variables and superglobals, directly on the map
·············································分割线······················································
引用可直接改变全局变量的值
$_FILES
获取上传文件的相关信息，注意：$_FILES是一个二维数组
error 错误状态码
