PHP Variables

Type-1
Local variable or user defined variable.
Syntax- $VARIABLE_NAME

Ex - $demo, $cust_name,$pic1 etc

Type-2
Global variables or pre-defined variables
a) $GLOBAL => To create a php global variable.

b) $_POST => To access value from a HTML form using 'post' method.

c) $_GET => To access value from a HTML form using 'get' method.

d) $_REQUEST => To access value from a HTML form using any method.

e) $_SERVER => To get data related to server.

f) $_SESSION => To create session storage.

g) $_COOKIE => To create a local storage.

h) $_ENV => To get or update data in PHP environment.

i. $_FILES => To access file details from a HTML form and upload to the server.