PROCEDURAL PHP - USER DEFINE FUNCTION

 

**For built-in functions, we can learn from the PHP.net documentation or W3Schools, as there are more than 1,000 built-in functions in PHP

- UDF is a function that we define ourselves
- Why UDF is important :
   1. To avoid writing repetitive code
   2. For modular programming (e.g., separating front-end code and back-end logic)

Click here to download lesson and code UDF in PHP