1/**
 2 * Convert Uploaded Images to WebP Format
 3 *
 4 * This snippet converts uploaded images (JPEG, PNG, GIF) to WebP format
 5 * automatically in WordPress. Ideal for use in a theme's functions.php file,
 6 * or with plugins like Code Snippets or WPCodeBox.
 7 *
 8 * @package    WordPress_Custom_Functions
 9 * @autor      Mark Harris
10 * @link       www.christchurchwebsolutions.co.uk
11 *
12 * Usage Instructions:
13 * - Add this snippet to your theme's functions.php file, or add it as a new
14 *   snippet in Code Snippets or WPCodeBox.
15 * - The snippet hooks into WordPress's image upload process and converts
16 *   uploaded images to the WebP format.
17 *
18 * Optional Configuration:
19 * - By default, the original image file is deleted after conversion to WebP.
20 *   If you prefer to keep the original image file, simply comment out or remove
21 *   the line '@unlink( $file_path );' in the wpturbo_handle_upload_convert_to_webp function.
22 *   This will preserve the original uploaded image file alongside the WebP version.
23 */
24 
25add_filter('wp_handle_upload', 'wpturbo_handle_upload_convert_to_webp');
26 
27function wpturbo_handle_upload_convert_to_webp($upload) {
28    if ($upload['type'] == 'image/jpeg' || $upload['type'] == 'image/png' || $upload['type'] == 'image/gif') {
29        $file_path = $upload['file'];
30 
31        // Check if ImageMagick or GD is available
32        if (extension_loaded('imagick') || extension_loaded('gd')) {
33            $image_editor = wp_get_image_editor($file_path);
34            if (!is_wp_error($image_editor)) {
35                $file_info = pathinfo($file_path);
36                $dirname   = $file_info['dirname'];
37                $filename  = $file_info['filename'];
38 
39                // Create a unique file path for the WebP image
40                $def_filename = wp_unique_filename($dirname, $filename . '.webp');
41                $new_file_path = $dirname . '/' . $def_filename;
42 
43                // Attempt to save the image in WebP format
44                $saved_image = $image_editor->save($new_file_path, 'image/webp');
45                if (!is_wp_error($saved_image) && file_exists($saved_image['path'])) {
46                    // Success: replace the uploaded image with the WebP image
47                    $upload['file'] = $saved_image['path'];
48                    $upload['url']  = str_replace(basename($upload['url']), basename($saved_image['path']), $upload['url']);
49                    $upload['type'] = 'image/webp';
50 
51                    // Optionally remove the original image
52                    @unlink($file_path);
53                }
54            }
55        }
56    }
57 
58    return $upload;
59}