// Open the directory to scan $dir = opendir('/path/to/directory'); // Loop through all files and folders in the directory while (($file = readdir($dir)) !== false) { // skip . and .. directories if ($file == '.' || $file == '..'){ continue; } // If the current file is a directory // recursively call this function to scan subdirectories if (is_dir($file)) { scanDirectory($file); } // If the current file is a file, preform a security check if (is_file($file)) { $contents = file_get_contents($file); // Perform security check on file contents } } // Close the directory handle closedir($dir);This code snippet is an example of a recursive directory scan in PHP. It opens a given directory and loops through all files and folders. The code checks if the current item is a file or folder. If it's a folder, the function calls itself recursively to scan the subfolders. If it's a file, it retrieves the file's contents and performs a security check on it. PHP File Scan is usually included in the PHP Standard Library.