Are there any best practices for naming and managing temporary images in PHP when integrating them into PDF files?

When integrating temporary images into PDF files in PHP, it is important to follow best practices for naming and managing these images to avoid conflicts or security vulnerabilities. One approach is to generate a unique filename for each temporary image using a combination of a timestamp and a random string. Additionally, it is recommended to store these images in a secure directory outside of the web root to prevent direct access.

// Generate a unique filename for the temporary image
$tempImageFilename = uniqid() . '_' . bin2hex(random_bytes(8)) . '.jpg';

// Save the temporary image to a secure directory outside of the web root
$tempImagePath = '/path/to/secure/directory/' . $tempImageFilename;

// Code to integrate the temporary image into a PDF file
// (e.g. using a library like TCPDF or FPDF)

// Once the image is no longer needed, delete the temporary file
unlink($tempImagePath);