Predefined Variables

Table of Contents

• Superglobals — 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 — Query string variables
• $_POST — Form data from HTTP POST requests
• $_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_response_header — HTTP response headers
• $argc — The number of arguments passed to script
• $argv — Array of arguments passed to script