使用require_once / ob_start（）进行可变访问

Question

Maybe I'm just tired or just am simply confused, but I'm having a strange issue dealing with some require_once() calls and ob_start().

Basic Structure:

Top of Main.php:

require_once 'config.php'; // includes variable $A = "bar", and Function "foo"

function getPage(){
  ob_start();
  include 'some_file.php';
  $html = ob_get_clean();
  echo $html;
  die();
}
getPage();

some_file.php

require_once 'config.php'; // includes same config file
var_dump($A); // NULL
foo(); // runs, returns correct value

Config.php

$A = 'bar';

function foo(){
  return "FOO";
}

So, what is wrong here? I'm including a file while buffering output. The required file config.php holds a variable and function. When including some_file.php during the buffer, the variable $A is apparently NOT set/accessible. The function foo CAN execute.

Answer 1

The documentation says:

When a file is included, the code it contains inherits the variable scope of the line on which the include occurs. Any variables available at that line in the calling file will be available within the called file, from that point forward. However, all functions and classes defined in the included file have the global scope.