描述：

• 导入footer.php文件。
• 如果设置了参数 $name ，则会导入footer-{name}.php文件。
• 如果主题文件夹中没有footer-{name}.php文件，则导入wordpress默认主题的sidebar.php文件（wp-includes/theme-compat/footer.php）。

用法：

<?php get_footer( $name ); ?>

参数：

$name

(string) (可选) 调用 footer-name.php.

默认值: None

返回值：

None

示例：

<?php get_header(); ?>
<h2>Error 404 - Not Found</h2>
<?php get_sidebar(); ?>
<?php get_footer(); ?>

源文件：

/**
 * Load footer template.
 *
 * Includes the footer template for a theme or if a name is specified then a
 * specialised footer will be included.
 *
 * For the parameter, if the file is called "footer-special.php" then specify
 * "special".
 *
 * @since 1.5.0
 *
 * @param string $name The name of the specialised footer.
 */
function get_footer( $name = null ) {
	/**
	 * Fires before the footer template file is loaded.
	 *
	 * The hook allows a specific footer template file to be used in place of the
	 * default footer template file. If your file is called footer-new.php,
	 * you would specify the filename in the hook as get_footer( 'new' ).
	 *
	 * @since 2.1.0
	 * @since 2.8.0 $name parameter added.
	 *
	 * @param string $name Name of the specific footer file to use.
	 */
	do_action( 'get_footer', $name );

	$templates = array();
	$name = (string) $name;
	if ( '' !== $name )
		$templates[] = "footer-{$name}.php";

	$templates[] = 'footer.php';

	// Backward compat code will be removed in a future release
	if ('' == locate_template($templates, true))
		load_template( ABSPATH . WPINC . '/theme-compat/footer.php');
}