# Function Declaration
 
A function is declared using the `function` keyword, followed by the function name, parentheses for parameters, and a code block. Function names are case-insensitive in PHP. Functions can be defined anywhere in a file and are available throughout the script scope once declared.

Visit the following resources to learn more:

- [@official@User Defined Functions](https://www.php.net/manual/en/functions.user-defined.php)