previous_post() WordPress Function

function previous_post($format='%', $previous='previous post: ', $title='yes', $in_same_cat='no', $limitprev=1, $excluded_categories='') {

	_deprecated_function( __FUNCTION__, '2.0.0', 'previous_post_link()' );

	if ( empty($in_same_cat) || 'no' == $in_same_cat )
		$in_same_cat = false;
	else
		$in_same_cat = true;

	$post = get_previous_post($in_same_cat, $excluded_categories);

	if ( !$post )
		return;

	$string = '<a href="'.get_permalink($post->ID).'">'.$previous;
	if ( 'yes' == $title )
		$string .= apply_filters('the_title', $post->post_title, $post->ID);
	$string .= '</a>';
	$format = str_replace('%', $string, $format);
	echo $format;
}
Uses	Description
wp-includes/functions.php:_deprecated_function()	Mark a function as deprecated and inform when it has been used.
wp-includes/link-template.php:get_previous_post()	Retrieves the previous post that is adjacent to the current post.
wp-includes/link-template.php:get_permalink()	Retrieves the full permalink for the current post or post ID.
wp-includes/plugin.php:apply_filters()	Calls the callback functions that have been added to a filter hook.
wp-includes/post-template.php:the_title	Filters the post title.