Examples of Built-In and User Defined Functions

Built-In Function Example

Here is an example of a Built-In Function
The length of the word supercalifragilisticexpialidocious is 34

The built-in function used here is mb_strlen, which is used to count the number of characters in a word.

User Defined Function Example

Here is the result of a User Defined Function
10

This user defined function agrument is passed by reference, which uses the "&" operator in front of the agrument parameter.