Answers for "php require_once"

php require vs require_once

//The require statement has two variations, require and require_once.
//The require/require_once statement is used to include file.

// Require a file to be imported or quit if it can't be found
<?php
 require 'requiredfile.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';
?>

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';
?>

php requuire once

require_once('var.php');

php require

// Require a file to be imported or quit if it can't be found
<?php
 require 'somefile.php';
?>
  
// Alternatively: Include a file, if it can't be found: continue.
<?php
include 'vars.php';
?>

php require_once

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

require_once different on server

define('__ROOT__', dirname(dirname(__FILE__))); //call define untill you get to the root directory
require_once (__ROOT__."/Path/To/File.php"); //append __ROOT__ to the string