get_previous_post( bool $in_same_term = false, int[]|string $excluded_terms = '', string $taxonomy = 'category' )
Retrieves the previous post that is adjacent to the current post.
Parameters
- $in_same_term
-  (bool) (Optional) Whether post should be in a same taxonomy term. Default value: false 
- $excluded_terms
-  (int[]|string) (Optional) Array or comma-separated list of excluded term IDs. Default value: '' 
- $taxonomy
-  (string) (Optional) Taxonomy, if $in_same_term is true. Default value: 'category' 
Return
(null|string|WP_Post) Post object if successful. Null if global $post is not set. Empty string if no corresponding post exists.
Source
File: wp-includes/link-template.php
function get_previous_post( $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
	return get_adjacent_post( $in_same_term, $excluded_terms, true, $taxonomy );
}  Changelog
| Version | Description | 
|---|---|
| 1.5.0 | Introduced. | 
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Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/functions/get_previous_post