📄️ What Are Superglobals?
Superglobals in PHP are a group of global variables that are accessible from anywhere within a PHP script, including functions and classes. These variables are associative arrays that store information about the current request, session, and server environment. Superglobals are one of the features of PHP that makes it so practical to work with, however, they can also be a source of security vulnerabilities if not used correctly. I think that is a big part of why some developers have an issue with PHP. It's not that they are inherently bad, but they can be misused.
📄️ $\_SERVER - Understanding Server Variables
When working with web applications, it's essential to have access to various server-related information. In PHP, this information is made available through server variables using the $_SERVER superglobal array. There will be times when you need to access the file path, server name, user agent string and other values and these variables provide a convenient way to do so.
📄️ $\_ENV & $\_GLOBALS Superglobals
In this lesson, we will look at environment and global variables.
📄️ $_GET Superglobal
In PHP, the $_GET superglobal is a built-in array that allows you to retrieve data sent to your script via URL parameters (query strings) as well as data sent via the GET method. This could be data from a form, an HTTP/AJAX request, or a link click. In this lesson, we'll focus on retrieving data from the query string.
📄️ $_POST Superglobal
In PHP, $POST is a superglobal array that allows you to retrieve data that has been sent to the server using the HTTP POST method. It is commonly used to handle form submissions and other types of user input. In this lesson, we will explore the $POST superglobal and how it works.
📄️ $_REQUEST Superglobal
In PHP, the $_REQUEST superglobal is a built-in array that contains data that was submitted in an HTML form using either the GET or POST method. It is also used to get data from HTTP requests that are sent using either the GET or POST method.
📄️ $_FILES Superglobal
Uploading files is a common task in web development, especially when building applications that involve user-generated content or file management systems. PHP provides a convenient way to handle file uploads through the $FILES superglobal. In this lesson, we'll explore how to work with file uploads using $FILES in PHP.
📄️ Alert Message Challenge
Alright, in the last lesson, we looked at the $_FILES superglobal and how to upload files. In this lesson, I want you to try out a challenge.
📄️ $_SESSION Superglobal
In web development, maintaining user data across multiple requests is a fundamental requirement. PHP provides a built-in mechanism for this purpose called $SESSION. The $SESSION superglobal enables developers to store and manage user-specific data on the server-side, ensuring it persists between HTTP requests. In this lesson, we'll explore what $_SESSION is, how it works, and how to use it effectively in your PHP applications.
📄️ Understanding $\_COOKIE in PHP: A Guide
Cookies play a significant role in web development and user experience. They allow you to store data on a user's device, making it accessible between different page visits or sessions. In PHP, you can work with cookies using the $COOKIE superglobal. In this lesson, I will explain what $COOKIE is, how to set and retrieve cookies, and some best practices for using them.