In PHP, NULL refers to the lack of having a value. There are differences between setting a variable as NULL or setting a variable as an empty string. The PHP function empty cannot differentiate between similar variables such as NULL, false, and 0. This is a leading cause of bugs for coders. Learn about using NULL and empty correctly in this PHP with MySQL tutorial.
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In this video, we're going to be talking about NULL. …NULL is a fancy term for nothing, for not having a value. …It's not zero. It's not an empty string. …It's the actual lack of a value. And if we can set a value into a …variable, we also have to have some way to talk about the fact that variable …might not have a value at all. And null allows us to do that. …Let's take a look at it by first creating a page where we can work with null. …And I'm going to do that by opening up basic.html, and then choosing Save As. …We're going to save this as null.php. So, null now, like true and false, the …booleans that we just talked about. Null can either be written in lower case, …or in all upper case. And you'll waste a lot of time arguing …with people about the right way to do it in PHP.…
And whether one is better than the other, or one has better performance than the other. …The truth is that they're case insensitive and that you can use …absolutely whichever one you prefer. There is no difference. …
- 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
PHP with MySQL Beyond the Basicswith Kevin Skoglund10h 26m Intermediate
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
Next steps2m 4s
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