WordPress免插件实现上传图片自动转为WebP格式 加速网站打开速度

/**
 * 上传图片自动转为WebP格式
 */
add_filter('wp_handle_upload', 'wpturbo_handle_upload_convert_to_webp');
function wpturbo_handle_upload_convert_to_webp($upload) {
    if (in_array($upload['type'], ['image/jpeg', 'image/png', 'image/gif'])) {
        $file_path = $upload['file'];
        if (extension_loaded('imagick') || extension_loaded('gd')) {
            $image_editor = wp_get_image_editor($file_path);
            if (!is_wp_error($image_editor)) {
                // Set WebP quality (adjust as needed)
                $quality = 90; // Adjust between 0 (low) to 100 (high)
                $image_editor->set_quality($quality); // Set quality for WebP conversion
                $file_info = pathinfo($file_path);
                $dirname = $file_info['dirname'];
                $filename = $file_info['filename'];
                $def_filename = wp_unique_filename($dirname, $filename . '.webp');
                $new_file_path = $dirname . '/' . $def_filename;
                $saved_image = $image_editor->save($new_file_path, 'image/webp');
 
                // 检查转换是否成功且文件大小不为0
                if (!is_wp_error($saved_image) && file_exists($saved_image['path']) && filesize($saved_image['path']) > 0) {
                    // Update the upload data to use the WebP image
                    $upload['file'] = $saved_image['path'];
                    $upload['url'] = str_replace(basename($upload['url']), basename($saved_image['path']), $upload['url']);
                    $upload['type'] = 'image/webp';
                    // 删除原始文件
                    @unlink($file_path);
                } else {
                    // 如果转换失败或文件为0KB，删除可能创建的无效WebP文件
                    if (file_exists($new_file_path)) {
                        @unlink($new_file_path);
                    }
                    // 保持原始文件不变
                }
            }
        }
    }
    return $upload;
}