How to use php predefined variables

1. $GLOBALS

Description: globals is a built-in feature of PHP that can automatically obtain the contents of all variables in the current page, including local variables. , global variables, static variables

2, $_SERVER

Description: The server will automatically obtain server and client information

$_SERVER is a containing An array of information such as header, path, and script locations.

3. $_FILES

Description: Get information about uploaded files

4.$_GET: Transmit data in url mode

Explanation: In fact, it is the browser address transmission method

Transmission method: URL address?Parameter value 1=value 1&Parameter value 2=value 2….

Transmission form: The get method and hyperlink method of the form

5, $_POST: http post method to transmit data

Description: Transmit data through the post method of http protocol

Transmission method: form post method or ajax

6, $_REQUEST: http request variable

Description: $_GET and $_POST are included by default and array of $_COOKIED

Recommended tutorial: PHP video tutorial

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