Category: 06. Superglobals

One of the superglobal variables in PHP, $_SESSION is an associative array of session variables available in the current script. $HTTP_SESSION_VARS also contains the same information, but it is not a superglobal, and it has now been deprecated. What is a Session? A Session is an alternative way to make data accessible across the pages of an entire website.…

The PHP superglobal $_COOKIE stores the variables passed to the current PHP script along with the HTTP request in the form of cookies. $HTTP_COOKIE_VARS also contains the same information, but it is not a superglobal, and it has now been deprecated. What is a Cookie? Cookies are text files stored by a server on the…

$_ENV is a superglobal variable in PHP. It is an associative array that stores all the environment variables available in the current script. $HTTP_ENV_VARS also contains the same information, but it is not a superglobal, and it has now been deprecated. The environment variables are imported into the global namespace. Most of these variables are provided by the…

$_FILES is one of the ‘superglobal’, or automatic global, variables in PHP. It is available in all scopes throughout a script. The variable $_FILES is an associative array containing items uploaded via HTTP POST method. A file is uploaded when a HTML form contains an input element with a file type, its enctype attribute set…

$_GET is one of the superglobals in PHP. It is an associative array of variables passed to the current script via the query string appended to the URL of HTTP request. Note that the array is populated by all requests with a query string in addition to GET requests. $HTTP_GET_VARS contains the same initial information,…

$_POST is one of the predefined or superglobal variables in PHP. It is an associative array of key-value pairs passed to a URL by the HTTP POST method that uses URLEncoded or multipart/form-data content-type in the request. Assuming that the URL in the browser is “http://localhost/hello.php”, method=POST is set in a HTML form “hello.html” as…

In PHP, $_REQUEST is a superglobal variable. It is an associative array which is a collection of contents of $_GET, $_POST and $_COOKIE variables. $_REQUEST with GET Method Save the following script in the document folder of the Apache server. If you are using XAMPP server on Windows, place the script as “hello.php” in the…

$_SERVER is a superglobal in PHP. It holds information regarding HTTP headers, path and script location, etc. The following table lists some of the important server variables of the $_SERVER array followed by the description of their values. Sr.No Server Variables & Description 1 PHP_SELFStores filename of currently executing script. 2 SERVER_ADDRThis property of array…

$GLOBALS is one of the “superglobal” or “automatic global” variables in PHP. It is available in all scopes throughout a script. There is no need to do “global $variable;” to access it within functions or methods. $GLOBALS is an associative array of references to all globally defined variables. The names of variables form keys and…

The PHP parser populates the current script with a number of predefined variables in its global namespace. The predefined variables are known as “PHP superglobals“. Most of the superglobals in PHP are associative arrays, and the web server populates them. Hence, if a script is run in the command-line environment, some of the superglobals may…