include include_once require require_once in php code example

Example 1: require_once php

// Require_once is ignored if the required file has already been added by any of the include statements.
<?php
 require_once 'require_oncefile.php';
?>

Example 2: php require_once

define('__ROOT__', dirname(dirname(__FILE__)));
require_once(__ROOT__.'whatever');

Example 3: require and require_once difference in php

As there is two different kind of require statements i.e. require and require_once
both are having same functionality of including file into the another.
  
Using require if the file is not misplaced or undefined then its stops the execution of the document.
<?php
 require 'requiredfile.php';
?>
  
And require_once is gets ignored if the file already imported with any other require or require_once.
<?php
 require_once 'require_oncefile.php';
?>