What potential pitfalls should be considered when using opendir(), scandir(), and closedir() functions in PHP?

One potential pitfall when using opendir(), scandir(), and closedir() functions in PHP is not properly handling errors that may occur during directory operations. It is important to check for errors and handle them gracefully to prevent unexpected behavior or security vulnerabilities in your application. Additionally, failing to close the directory handle with closedir() can lead to resource leaks and potentially degrade the performance of your script.

// Example code snippet demonstrating proper error handling and closing of directory handle

$dir = "/path/to/directory";

// Open directory handle
$handle = opendir($dir);

// Check for errors
if(!$handle) {
    die("Unable to open directory");
}

// Read directory contents
$files = scandir($dir);

// Check for errors
if($files === false) {
    die("Unable to read directory contents");
}

// Process directory contents
foreach($files as $file) {
    // Do something with each file
}

// Close directory handle
closedir($handle);