add watermark to images in php

watermark.php

<?php

declare(strict_types=1);

// Set the directory containing the images
$dir = realpath(dirname(__FILE__)) . "/";

// Scan the directory for image files
$files = scandir($dir);

$output_dir = $dir . "/output/";

// Set the allowed file types
$file_types = array('jpg', 'jpeg', 'png');

$watermark = imagecreatefrompng('/path/to/watermark.png');

// Iterate through the list of files
foreach ($files as $file) {
    try {
        if (!is_file($file)) {
            continue;
        }
        // Check if the file is an image
        $image_type = exif_imagetype($dir . $file);

        if ($image_type && in_array(strtolower(pathinfo($file, PATHINFO_EXTENSION)), $file_types)) {
            // Load the original image

            $image = null;
            // Load the original image using the appropriate function
            if ($image_type == IMAGETYPE_JPEG) {

                $image = imagecreatefromjpeg($dir . $file);
            } elseif ($image_type == IMAGETYPE_PNG) {
                $image = imagecreatefrompng($dir . $file);
            } else {
                continue;
            }

            $image_width = imagesx($image);
            $image_height = imagesy($image);
            // Get the dimensions of the watermark image
            $watermark_width = imagesx($watermark);
            $watermark_height = imagesy($watermark);
            // Calculate the position of the watermark on the image
            $dest_x = $image_width - $watermark_width -5;
            $dest_y = $image_height - $watermark_height - 5;
            // Copy the watermark onto the original image
            imagecopy($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height);

            // Save the watermarked image to the output directory
            $UUID = vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex(random_bytes(16)), 4));
            
            imagejpeg($image, $output_dir .  $UUID . ".jpg", 100);
            // Destroy the image resources to free up memory
            imagedestroy($image);
        }
    } catch (\Throwable $th) {
        echo $file . "\n";
    }
}

imagedestroy($watermark);