echo “Variables”; ($a=10; (int))

In every programming language variables represent data that falls under a certain data type or predefined data available in the programming language. Variables allow authors to pre-process data, access server data and transmit data when needed. There are author defined and predefined variables in PHP.

PHP Variable Types

Basic Variables – Author defined variables Variable variables – Dynamcially named author defined variables Superglobals – Superglobals are 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 – HTTP GET variables $_POST – HTTP POST variables $_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_RAW_POST_DATA – Raw POST data $http_response_header – HTTP response headers $argc – The number of arguments passed to script $argv – Array of arguments passed to script


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