What is the potential issue with including a file that includes the original file in PHP?

Including a file that includes the original file in PHP can lead to an infinite loop where the files keep including each other indefinitely. This can cause the server to run out of memory and crash. To solve this issue, you can use the `defined()` function to check if a specific constant is defined before including the file. By defining a constant in the original file and checking for its existence in the included file, you can prevent the infinite loop. 

// original_file.php
define('INCLUDED_FILE', true);

// included_file.php
if (!defined('INCLUDED_FILE')) {
    include 'original_file.php';
}

Keywords

file inclusion PHP security vulnerability recursive inclusion code execution

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