Title: 2.5.1 | Developer.WordPress.org

---

# New and updated in 2.5.1

Functions

Hooks

Classes

Methods

 * class[Walker_Category_Checklist](https://developer.wordpress.org/reference/classes/walker_category_checklist/)
 * Core walker class to output an unordered list of category checkbox input elements.
 * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_category_checklist/#used-by)
   | Uses [1 function](https://developer.wordpress.org/reference/classes/walker_category_checklist/#uses)
   | Source: [wp-admin/includes/class-walker-category-checklist.php:19](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/class-walker-category-checklist.php#L19-L140)
 * method[Walker_Category_Checklist::start_lvl()](https://developer.wordpress.org/reference/classes/walker_category_checklist/start_lvl/)
 * Starts the list before the elements are added.
 * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_category_checklist/start_lvl/#used-by)
   | Uses [0 functions](https://developer.wordpress.org/reference/classes/walker_category_checklist/start_lvl/#uses)
   | Source: [wp-admin/includes/class-walker-category-checklist.php:37](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/class-walker-category-checklist.php#L37-L40)
 * method[Walker_Category_Checklist::end_lvl()](https://developer.wordpress.org/reference/classes/walker_category_checklist/end_lvl/)
 * Ends the list of after the elements are added.
 * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_category_checklist/end_lvl/#used-by)
   | Uses [0 functions](https://developer.wordpress.org/reference/classes/walker_category_checklist/end_lvl/#uses)
   | Source: [wp-admin/includes/class-walker-category-checklist.php:53](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/class-walker-category-checklist.php#L53-L56)
 * method[Walker_Category_Checklist::start_el()](https://developer.wordpress.org/reference/classes/walker_category_checklist/start_el/)
 * Start the element output.
 * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_category_checklist/start_el/#used-by)
   | Uses [6 functions](https://developer.wordpress.org/reference/classes/walker_category_checklist/start_el/#uses)
   | Source: [wp-admin/includes/class-walker-category-checklist.php:73](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/class-walker-category-checklist.php#L73-L122)
 * method[Walker_Category_Checklist::end_el()](https://developer.wordpress.org/reference/classes/walker_category_checklist/end_el/)
 * Ends the element output, if needed.
 * Used by [0 functions](https://developer.wordpress.org/reference/classes/walker_category_checklist/end_el/#used-by)
   | Uses [0 functions](https://developer.wordpress.org/reference/classes/walker_category_checklist/end_el/#uses)
   | Source: [wp-admin/includes/class-walker-category-checklist.php:137](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/class-walker-category-checklist.php#L137-L139)
 * function[wp_category_checklist()](https://developer.wordpress.org/reference/functions/wp_category_checklist/)
 * Outputs an unordered list of checkbox input elements labeled with category names.
 * Used by [1 function](https://developer.wordpress.org/reference/functions/wp_category_checklist/#used-by)
   | Uses [1 function](https://developer.wordpress.org/reference/functions/wp_category_checklist/#uses)
   | Source: [wp-admin/includes/template.php:40](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/template.php#L40-L52)
 * function[wp_link_category_checklist()](https://developer.wordpress.org/reference/functions/wp_link_category_checklist/)
 * Outputs a link category checklist element.
 * Used by [2 functions](https://developer.wordpress.org/reference/functions/wp_link_category_checklist/#used-by)
   | Uses [4 functions](https://developer.wordpress.org/reference/functions/wp_link_category_checklist/#uses)
   | Source: [wp-admin/includes/template.php:267](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/template.php#L267-L302)
 * hook[post_date_column_time](https://developer.wordpress.org/reference/hooks/post_date_column_time/)
 * Filters the published, scheduled, or unpublished time of the post.
 * Used by [1 function](https://developer.wordpress.org/reference/hooks/post_date_column_time/#used-by)
   | Uses [0 functions](https://developer.wordpress.org/reference/hooks/post_date_column_time/#uses)
   | Source: [wp-admin/includes/class-wp-posts-list-table.php:1251](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/class-wp-posts-list-table.php#L1251-L1251)
 * function[sanitize_sql_orderby()](https://developer.wordpress.org/reference/functions/sanitize_sql_orderby/)
 * Ensures a string is a valid SQL ‘order by’ clause.
 * Used by [0 functions](https://developer.wordpress.org/reference/functions/sanitize_sql_orderby/#used-by)
   | Uses [0 functions](https://developer.wordpress.org/reference/functions/sanitize_sql_orderby/#uses)
   | Source: [wp-includes/formatting.php:2415](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/formatting.php#L2415-L2420)