Can we include a file two times in any PHP page?

Yes, you can use include (or require) for the same file many times. PHP will add its code every time.

But there is a problem if that file declares a function or a class. The second include tries to create the same function again, and PHP stops with a fatal error like “Cannot redeclare function”.

<?php
include "helpers.php";
include "helpers.php";        // error if helpers.php has functions

include_once "helpers.php";   // safe: adds the file only one time
?>

Use include_once or require_once for files with functions, classes or settings. They check if the file was already added. See PHP File Inclusion.

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