How can one securely handle user-provided messages when uploading photos to Facebook using PHP?

User-provided messages should be sanitized and validated to prevent any malicious code injection when uploading photos to Facebook using PHP. One way to securely handle these messages is by using PHP's htmlspecialchars() function to escape special characters and prevent XSS attacks. 

// Sanitize and validate user-provided message
$user_message = htmlspecialchars($_POST['message']);

// Upload photo to Facebook with sanitized message
// Your code to upload photo to Facebook here

Keywords

Facebook API OAuth file upload validation encryption

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