How can the PHP code be optimized to handle different file types, not just PDFs, and send notifications based on user-defined time frames?

To optimize the PHP code to handle different file types and send notifications based on user-defined time frames, you can create a function that checks the file type before processing it and implement a notification system with a time-based trigger.

// Function to handle different file types and send notifications
function processFile($file, $notificationTime) {
    $fileType = pathinfo($file, PATHINFO_EXTENSION);

    // Check file type and process accordingly
    if($fileType == 'pdf') {
        // Process PDF file
    } elseif($fileType == 'doc' || $fileType == 'docx') {
        // Process Word document file
    } else {
        // Handle other file types
    }

    // Send notification based on user-defined time frame
    if(time() >= $notificationTime) {
        // Send notification
    }
}

// Example usage
$file = 'example.pdf';
$notificationTime = strtotime('tomorrow');
processFile($file, $notificationTime);