Once cookie values are set, they are sent to PHP every time a request is made. However, there are times when you may want to unset a cookie. As part of the PHP with MySQL series, this tutorial reviews some of the pitfalls that can occur with unsetting cooking values and then demonstrates a dual approach to unsetting -- setting the cookie to null and the cookie expiration date to a date in the past.
Now that we know how to set cookies, we know how to read back their values, we …should talk about how we unset cookies. How do you get rid of them when you're done? …A classic case of this could be when someone logs in you want to record their …user ID but then when they log out you want to get rid of it. …You want make them not logged in anymore. Well to do that we need to know how to …unset them. Let me first show you the wrong way to do it. …You do not want to do it by using the unset function. …That's what we use on variables when we want to unset them, it'll unset their value. …But think about it for a second, why would you not want to use unset on the …cookie global parameter? Why would that not work? …The reason why is because those are the values that came in from the last request.…
Says nothing about what the user has on their browser. …This is just a result of what came in on the last request. …Unless we provide the user with something different, that's what's going to keep …coming in for every future request. Unsending it isn't going to change it, …
- What is PHP?
- Installing and configuring PHP and MySQL
- Exploring data types
- Controlling code with logical expressions and loops
- Using PHP's built-in functions
- Writing custom functions
- Building dynamic webpages
- Working with forms and form data
- Using cookies and sessions to store data
- Connecting to MySQL with PHP
- Creating and editing database records
- Building a content management system
- Adding user authentication
Skill Level Beginner
Q: This course was revised on 6/4/2013. What changed?
A: The old version of this course was 6 years old and it was time for a complete revision, using PHP 5.4. (The tutorials will work with any version of PHP and covers any differences you might encounter). The author has also added updated installation instructions for Mac OS X Mountain Lion and Windows 8. The topics and end project are the same, but the code is slightly different. It also addresses frequently asked questions from the previous version.
Q: This course was updated on 5/20/2015. What changed?
A: We added one movie called "Changing the document root in Yosemite," which helps the Mac installation run more smoothly.
1. PHP Overview
2. Mac Installation
3. Windows Installation
4. First Steps
5. Exploring Data Types
6. Control Structures: Logical Expressions
7. Control Structures: Loops
8. User-Defined Functions
10. Building Web Pages with PHP
11. Working with Forms and Form Data
12. Working with Cookies and Sessions
13. MySQL Basics
14. Using PHP to Access MySQL
15. Building a Content Management System (CMS)
16. Using Site Navigation to Choose Content
17. Application CRUD
18. Building the Public Area
19. Regulating Page Access
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