/**

 * Convert Uploaded Images to WebP Format

 *

 * This snippet converts uploaded images (JPEG, PNG, GIF) to WebP format

 * automatically in WordPress. Ideal for use in a theme's functions.php file,

 * or with plugins like Code Snippets or WPCodeBox.

 * 

 * @package    WordPress_Custom_Functions

 * @author     Mark Harris

 * @link       www.christchurchwebsolutions.co.uk

 *

 * Usage Instructions:

 * - Add this snippet to your theme's functions.php file, or add it as a new

 *   snippet in Code Snippets or WPCodeBox.

 * - The snippet hooks into WordPress's image upload process and converts

 *   uploaded images to the WebP format.

 *

 * Optional Configuration:

 * - By default, the original image file is deleted after conversion to WebP.

 *   If you prefer to keep the original image file, simply comment out or remove

 *   the line '@unlink( $file_path );' in the wpturbo_handle_upload_convert_to_webp function.

 *   This will preserve the original uploaded image file alongside the WebP version.

 */

add_filter( 'wp_handle_upload', 'wpturbo_handle_upload_convert_to_webp' );

function wpturbo_handle_upload_convert_to_webp( $upload ) {

    if ( $upload['type'] == 'image/jpeg' || $upload['type'] == 'image/png' || $upload['type'] == 'image/gif' ) {

        $file_path = $upload['file'];

        // Check if ImageMagick or GD is available

        if ( extension_loaded( 'imagick' ) || extension_loaded( 'gd' ) ) {

            $image_editor = wp_get_image_editor( $file_path );

            if ( ! is_wp_error( $image_editor ) ) {

                $file_info = pathinfo( $file_path );

                $dirname   = $file_info['dirname'];

                $filename  = $file_info['filename'];

                // Create a new file path for the WebP image

                $new_file_path = $dirname . '/' . $filename . '.webp';

                // Attempt to save the image in WebP format

                $saved_image = $image_editor->save( $new_file_path, 'image/webp' );

                if ( ! is_wp_error( $saved_image ) && file_exists( $saved_image['path'] ) ) {

                    // Success: replace the uploaded image with the WebP image

                    $upload['file'] = $saved_image['path'];

                    $upload['url']  = str_replace( basename( $upload['url'] ), basename( $saved_image['path'] ), $upload['url'] );

                    $upload['type'] = 'image/webp';

                    // Optionally remove the original image

                    @unlink( $file_path );

                }

            }

        }

    }

    return $upload;

}