询问$_AUTH, $_DATA, $_PE等意义
看到一个比较复杂的程序，用到这些变量，不知道是什么意思，是内置 变量还是作者自己命名的啊，百度搜索也找不到，谢谢$_AUTH
ACTION
$_PE
$_DATA
$_T
这些应该都是自己定义的。
Predefined Variables
PHP provides a large number of predefined variables to all scripts. The variables represent everything from external variables to built-in environment variables, last error messages to last retrieved headers.
See also the FAQ titled "How does register_globals affect me?"
Table of Contents
Superglobals — Superglobals are built-in variables that are always available in all scopes
$GLOBALS — References all variables available in global scope
$_SERVER — Server and execution environment information
$_GET — HTTP GET variables
$_POST — HTTP POST variables
$_FILES — HTTP File Upload variables
$_REQUEST — HTTP Request variables
$_SESSION — Session variables
$_ENV — Environment variables
$_COOKIE — HTTP Cookies
$php_errormsg — The previous error message
$HTTP_RAW_POST_DATA — Raw POST data
$http_response_header — HTTP response headers
$argc — The number of arguments passed to script
$argv — Array of arguments passed to script
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