How can PHP be used to fax without relying on fax-to-mail services?

To fax without relying on fax-to-mail services, you can use a PHP library like PHPFax that allows you to send faxes directly through a fax server or fax modem. This library provides functions to connect to the fax server, upload the document to be faxed, and send the fax using the appropriate settings.

// Include the PHPFax library
require_once('PHPFax.php');

// Initialize PHPFax with fax server settings
$fax = new PHPFax('fax.server.com', 'username', 'password');

// Upload the document to be faxed
$fax->addDocument('path/to/document.pdf');

// Set the recipient's fax number
$fax->setRecipient('+1234567890');

// Send the fax
$result = $fax->sendFax();

// Check if the fax was sent successfully
if($result) {
    echo 'Fax sent successfully!';
} else {
    echo 'Failed to send fax. Error: ' . $fax->getError();
}