How Can PHP Efficiently Deliver Files On-Demand to Users?

Delivering Files On-Demand: A Comprehensive Guide

In the realm of web development, efficiently transmitting files to users plays a pivotal role in enhancing user experience. When it comes to distributing PDF files, PHP offers several effective methods to accomplish this task.

Leveraging readfile() for Efficient File Retrieval

Assuming the PDF file resides on the server, the readfile() function emerges as a powerful option for sending the file to the user. This function reads the specified file and outputs its contents directly to the user's browser.

However, a crucial consideration when using readfile() is the definition of appropriate headers. Without headers, the client may indefinitely await a response. To address this, the PHP manual provides a comprehensive example:

$file = 'monkey.gif';

if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename='.basename($file));
    header('Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    ob_clean();
    flush();
    readfile($file);
    exit;
}

By implementing this code, you can swiftly transmit PDF files to users, ensuring a seamless and responsive browsing experience.

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