_php base of Super global variable in PHP

Super global variables in PHP start with PHP 4.2.0, register_globals default is off, so that many of the previous variables that can be used directly, such as $PHP _self or your set of Session variables cannot be accessed in the form of "$ variable name". This may give you a lot of the same, but it will help you improve your security. To access these variables, you need to use PHP super global variables, as follows:

$_server
Variables are set by the WEB server or are directly associated with the execution environment of the current script. Similar to the old array $HTTP _server_vars array. Previous $php_self correspond to $_server[' php_self ', you can use Phpinfo to view your $_server variables.

$_get
A variable that is submitted to a script via an HTTP get method. Similar to the old array $HTTP _get_vars array.

$_post
A variable that is submitted to the script via the HTTP POST method. Similar to the old array $HTTP _post_vars array.

$_cookie
A variable that is submitted to a script via an HTTP cookie method. Similar to the old array $HTTP _cookie_vars array.

$_session
The variable currently registered to the script session. Similar to the old array $HTTP _session_vars array.

$_files
A variable submitted to the script via an HTTP POST file upload. Similar to the old array $HTTP _post_files array.

$_env
Executes the variables that the environment submits to the script. Similar to the old array $HTTP _env_vars array.

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For $_files variables: (File Field field is "MyFile")

$_files[' myfile ' [' Name ']
The original name of the client machine file (including the path).

$_files[' myfile ' [' type ']
The MIME type of the file, which requires the browser to provide support for that information, such as "Image/gif".

$_files[' myfile ' [' Size ']
The size of the uploaded file in bytes.

$_files[' myfile ' [' Tmp_name ']
Temporary file name (including path) stored on the server after the file is uploaded.

$_files[' myfile ' [' Error ']
The error code associated with the file upload. [' ERROR '] is added in PHP version 4.2.0.

When the register_globals in PHP.ini is set to ON, the $myfile _name equivalent to $_files[' myfile ' [' name '], $myfile _type equivalent to $_files[' myfile '] [' Type '], and so on.