How to call php function from another file?

Question

I want to call my custom php function from my index.php, but the function is located in another file. Ho to do that ?

Example :

index.php :

<?php

myCustomFunction();

?>

function.php

<?php

function myCustomFunction(){
//some codes
}

?>

Thank you.

Answer 1

Change index.php as follows:

<?php
  include "function.php";
  myCustomFunction();
?>

(this is based on the assumption that both files are in the same directory, otherwise you have to add the filepath in the include line)