A constant is a value that, unlike a variable, always remains set at the same value. Values for constants are set by using the define function, which defines values that you don't want to be changed. Using constants in PHP is useful for saving data that needs to be fixed. This MySQL training video will help you understand how to define and use constants in PHP.
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We started off this chapter by talking about variables. …So, it's fitting that we're going to end it by talking about constants. …As you can guess from the name, a constant is the opposite of a varible. …A vaible can change or vary. A constant can't change. …It remains constantly set at the same value. …Constants are going to be recognizable on PHP because they're always written in all …capital letters and there's no dollar sign in front of them. …They're also going to differ from variables in another way. …The only way to set a value for constant is to use a function. …The define function. You can't just use the equal sign to …assign a value. Like you can with variable.…
Lets try some experiments. want to open up basic.html. …And then we'll just do save as. And we're going to call this constants.php. …Change the title here to constants. And let's give ourselves a PHP block. …Now, we know how variables work. Let's say we had max width equals to 980. …That would be a variable set at the integer 980. …
- 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
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