$filename = 'config.php'; $newConfig = ' $host = "localhost"; $user = "root"; $password = "mypassword"; $database = "mydatabase"; '; // Backup the original file copy($filename, $filename . '.bak'); // Write the new config to the file file_put_contents($filename, $newConfig); // Reload the configuration include($filename);
$filename = 'my_script.php'; $newCode = ' echo "Hello, world!"; '; // Open the script file $file = fopen($filename, 'a'); // Write the new code to the file fwrite($file, $newCode); // Close the file fclose($file); // Reload the modified script include($filename);In this example, the user input is the new code that will be added to the PHP script. The script opens the file in append mode, writes the new code to the file, closes the file, and then includes the modified script. The package library that provides support for PHP self replace functionality is the "runkit" extension. This extension provides a set of functions for modifying the runtime behavior of PHP, including the ability to redefine functions and classes, add new functions, and manipulate the scripts themselves.