Superglobal variables in PHP_PHP tutorial

Superglobal variables in PHP Starting from PHP 4.2.0, the default value of register_globals is off. As a result, many variables that can be used directly in the past, such as $PHP_SELF or the SESSION variable you set, cannot be accessed in the form of "$variable name". This may leave you with a lot of changes, but it will help improve security. To access these variables, you need to use PHP superglobal variables, as follows:

$_SERVER
Variables are set by the web server or directly associated with the execution environment of the current script. Similar to the old $HTTP_SERVER_VARS array. The previous $PHP_SELF corresponds to $_SERVER['PHP_SELF']. You can use phpinfo to view your $_SERVER variable.

$_GET
Variables submitted to the script via the HTTP GET method. Similar to the old $HTTP_GET_VARS array.

$_POST
Variables submitted to the script via the HTTP POST method. Similar to the old $HTTP_POST_VARS array.

$_COOKIE
A variable submitted to the script via the HTTP Cookies method. Similar to the old $HTTP_COOKIE_VARS array.

$_SESSION
The variable currently registered for the script session. Similar to the old $HTTP_SESSION_VARS array.

$_FILES
Variables submitted to the script via HTTP POST file upload. Similar to the old $HTTP_POST_FILES array.

$_ENV
Variables submitted by the execution environment to the script. Similar to the old $HTTP_ENV_VARS array.

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For $_FILES variable: (The file domain field is "myfile")

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

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

$_FILES['myfile']['size']
The size of the uploaded file, in bytes.

$_FILES['myfile']['tmp_name']
The temporary file name (including path) stored on the server after the file is uploaded.

$_FILES['myfile']['error']
Error code related to the file upload. ['error'] was added in PHP 4.2.0.

When register_globals in php.ini is set to on, $myfile_name is equivalent to $_FILES['myfile']['name'], $myfile_type is equivalent to $_FILES['myfile'][ 'type'] etc.

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