mce_buttons

				$mce_buttons[] = 'wp_adv';

				/**
				 * Filters the first-row list of TinyMCE buttons (Visual tab).
				 *
				 * @since 2.0.0
				 *
				 * @param array  $buttons   First-row list of buttons.
				 * @param string $editor_id Unique editor identifier, e.g. 'content'.
				 */
				$mce_buttons = apply_filters( 'mce_buttons', $mce_buttons, $editor_id );

				$mce_buttons_2 = array( 'strikethrough', 'hr', 'forecolor', 'pastetext', 'removeformat', 'charmap', 'outdent', 'indent', 'undo', 'redo' );

				if ( ! wp_is_mobile() ) {
					$mce_buttons_2[] = 'wp_help';
				}

				/**
				 * Filters the second-row list of TinyMCE buttons (Visual tab).

		'alignright',
		'link',
		'unlink',
		'wp_more',
		'spellchecker',
		'wp_add_media',
		'wp_adv',
	);

	/* This filter is documented in wp-includes/class-wp-editor.php */
	$toolbar1 = apply_filters( 'mce_buttons', $toolbar1, 'classic-block' );

	$toolbar2 = array(
		'strikethrough',
		'hr',
		'forecolor',
		'pastetext',
		'removeformat',
		'charmap',
		'outdent',