Are there any limitations or restrictions when including PHP documents within other PHP documents?

When including PHP documents within other PHP documents, it is important to be mindful of the scope of variables and functions. If a variable or function is defined in the included PHP document, it will be accessible in the parent PHP document. However, if a variable or function is defined in the parent PHP document, it will not be accessible in the included PHP document. To avoid conflicts, it is recommended to use functions and classes to encapsulate code and avoid global variables. 

// parent.php
$variable = "Hello";
include 'child.php';

// child.php
echo $variable; // This will output "Hello"

Keywords

PHP include require nested include_once

Related Questions