Registers the scripts and styles to create a WordPress Gutenberg block that is rendered on PHP

wp-plugin-gutenberg-server-block.php

<?php    
    /**
     * Registers the dynamic server side block JS script and its styles
     *
     * @since    1.0.0
     * @return void
     */
    public function register_dynamic_block_action ( ) {

        $block_name = 'block-dynamic';

        $block_namespace = 'gutenberg-blocks-sample/' . $block_name;

        $script_slug = $this->plugin_name . '-' . $block_name;
        $style_slug = $this->plugin_name . '-' . $block_name . '-style';
        $editor_style_slug = $this->plugin_name . '-' . $block_name . '-editor-style';

        // The JS block script
         wp_enqueue_script( 
            $script_slug, 
            plugin_dir_url( __FILE__ ) . $block_name . '/block.build.js', 
            ['wp-blocks', 'wp-i18n', 'wp-element'], // Required scripts for the block
            filemtime(plugin_dir_path(__FILE__) . $block_name . '/block.build.js')
        );

        // The block style
        // It will be loaded on the editor and on the site
        wp_register_style(
            $style_slug,
            plugin_dir_url( __FILE__ )  . $block_name . '/css/style.css', 
            ['wp-blocks'], // General style
            filemtime(plugin_dir_path(__FILE__) . $block_name . '/css/style.css')
        );            

        // The block style for the editor only
        wp_register_style(
            $editor_style_slug,
            plugin_dir_url( __FILE__ ) . $block_name . '/css/editor.css', 
            ['wp-edit-blocks'], // Style for the editor
            filemtime(plugin_dir_path(__FILE__) . $block_name . '/css/editor.css')
        );
        
        // Registering the block
        register_block_type(
            $block_namespace,  // Block name with namespace
            [
                'style' => $style_slug, // General block style slug
                'editor_style' => $editor_style_slug, // Editor block style slug
                'editor_script' => $script_slug,  // The block script slug
                'render_callback' => [$this, 'block_dynamic_render_cb'], // The render callback
            ]
        );

    }