Title: 5.8.1 | Developer.WordPress.org

---

# New and updated in 5.8.1

Functions

Hooks

Classes

Methods

 * method[WP_Image_Editor::get_default_quality()](https://developer.wordpress.org/reference/classes/wp_image_editor/get_default_quality/)
 * Returns the default compression quality setting for the mime type.
 * Used by [1 function](https://developer.wordpress.org/reference/classes/wp_image_editor/get_default_quality/#used-by)
   | Uses [0 functions](https://developer.wordpress.org/reference/classes/wp_image_editor/get_default_quality/#uses)
   | Source: [wp-includes/class-wp-image-editor.php:317](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/class-wp-image-editor.php#L317-L328)
 * function[_wp_check_alternate_file_names()](https://developer.wordpress.org/reference/functions/_wp_check_alternate_file_names/)
 * Helper function to test if each of an array of file names could conflict with
   existing files.
 * Used by [1 function](https://developer.wordpress.org/reference/functions/_wp_check_alternate_file_names/#used-by)
   | Uses [1 function](https://developer.wordpress.org/reference/functions/_wp_check_alternate_file_names/#uses)
   | Source: [wp-includes/functions.php:2823](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/functions.php#L2823-L2835)
 * function[wp_get_default_extension_for_mime_type()](https://developer.wordpress.org/reference/functions/wp_get_default_extension_for_mime_type/)
 * Returns the first matched extension for the mime type, as mapped from wp_get_mime_types().
 * Used by [2 functions](https://developer.wordpress.org/reference/functions/wp_get_default_extension_for_mime_type/#used-by)
   | Uses [1 function](https://developer.wordpress.org/reference/functions/wp_get_default_extension_for_mime_type/#uses)
   | Source: [wp-includes/functions.php:3029](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/functions.php#L3029-L3037)
 * hook[wp_unique_filename](https://developer.wordpress.org/reference/hooks/wp_unique_filename/)
 * Filters the result when generating a unique file name.
 * Used by [1 function](https://developer.wordpress.org/reference/hooks/wp_unique_filename/#used-by)
   | Uses [0 functions](https://developer.wordpress.org/reference/hooks/wp_unique_filename/#uses)
   | Source: [wp-includes/functions.php:2809](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/functions.php#L2809-L2809)
 * function[get_theme_feature_list()](https://developer.wordpress.org/reference/functions/get_theme_feature_list/)
 * Retrieves list of WordPress theme features (aka theme tags).
 * Used by [3 functions](https://developer.wordpress.org/reference/functions/get_theme_feature_list/#used-by)
   | Uses [6 functions](https://developer.wordpress.org/reference/functions/get_theme_feature_list/#uses)
   | Source: [wp-admin/includes/theme.php:314](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/theme.php#L314-L408)