Adds the media button to the editor.

function media_buttons( $editor_id = 'content' ) {
	static $instance = 0;
	$instance++;

	$post = get_post();

	if ( ! $post && ! empty( $GLOBALS['post_ID'] ) ) {
		$post = $GLOBALS['post_ID'];
	}

	wp_enqueue_media( array( 'post' => $post ) );

	$img = ' ';

	$id_attribute = 1 === $instance ? ' id="insert-media-button"' : '';

	printf(
		'%s',
		$id_attribute,
		esc_attr( $editor_id ),
		$img . __( 'Add Media' )
	);

	/**
	 * Filters the legacy (pre-3.5.0) media buttons.
	 *
	 * Use {@see 'media_buttons'} action instead.
	 *
	 * @since 2.5.0
	 * @deprecated 3.5.0 Use {@see 'media_buttons'} action instead.
	 *
	 * @param string $string Media buttons context. Default empty.
	 */
	$legacy_filter = apply_filters_deprecated( 'media_buttons_context', array( '' ), '3.5.0', 'media_buttons' );

	if ( $legacy_filter ) {
		// #WP22559. Close  if a plugin started by closing  to open their own  tag.
		if ( 0 === stripos( trim( $legacy_filter ), '' ) ) {
			$legacy_filter .= '';
		}
		echo $legacy_filter;
	}
}