What are some security considerations when implementing a PHP script for faxing from a server?

When implementing a PHP script for faxing from a server, it is crucial to ensure that sensitive information such as API credentials are securely stored and not exposed in the code. Additionally, input validation should be performed to prevent injection attacks. It is also important to restrict access to the script and implement proper error handling to prevent information leakage. 

<?php
// Securely store API credentials
$api_key = "your_api_key";
$api_secret = "your_api_secret";

// Input validation to prevent injection attacks
$fax_number = filter_var($_POST['fax_number'], FILTER_SANITIZE_NUMBER_INT);
$file_path = '/path/to/file.pdf';

// Restrict access to the script
if($_SERVER['REMOTE_ADDR'] !== 'allowed_ip_address'){
    die("Access denied");
}

// Implement error handling
try {
    // Your faxing code here
} catch (Exception $e) {
    echo "Error: " . $e->getMessage();
}
?>

Keywords

SQL injection Cross-site scripting Input validation Secure file handling HTTPS encryption

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