Title: wp-includes/post.php | Page 4 of 9 | Developer.WordPress.org --- # File: wp-includes/post.php * function[wp_attachment_is_image()](https://developer.wordpress.org/reference/functions/wp_attachment_is_image/) * Determines whether an attachment is an image. * Used by [11 functions](https://developer.wordpress.org/reference/functions/wp_attachment_is_image/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/wp_attachment_is_image/#uses) | Source: [wp-includes/post.php:7170](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7170-L7172) * hook[get_lastpostdate](https://developer.wordpress.org/reference/hooks/get_lastpostdate/) * Filters the most recent time that a post on the site was published. * Used by [1 function](https://developer.wordpress.org/reference/hooks/get_lastpostdate/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/get_lastpostdate/#uses) | Source: [wp-includes/post.php:7558](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7558-L7558) * function[wp_mime_type_icon()](https://developer.wordpress.org/reference/functions/wp_mime_type_icon/) * Retrieves the icon for a MIME type or attachment. * Used by [5 functions](https://developer.wordpress.org/reference/functions/wp_mime_type_icon/#used-by) | Uses [9 functions](https://developer.wordpress.org/reference/functions/wp_mime_type_icon/#uses) | Source: [wp-includes/post.php:7184](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7184-L7325) * function[get_lastpostmodified()](https://developer.wordpress.org/reference/functions/get_lastpostmodified/) * Gets the most recent time that a post on the site was modified. * Used by [2 functions](https://developer.wordpress.org/reference/functions/get_lastpostmodified/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/get_lastpostmodified/#uses) | Source: [wp-includes/post.php:7577](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7577-L7616) * hook[icon_dir](https://developer.wordpress.org/reference/hooks/icon_dir/) * Filters the icon directory path. * Used by [3 functions](https://developer.wordpress.org/reference/hooks/icon_dir/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/icon_dir/#uses) | Source: [wp-includes/post.php:7229](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7229-L7229) * hook[get_lastpostmodified](https://developer.wordpress.org/reference/hooks/get_lastpostmodified/) * Filters the most recent time that a post on the site was modified. * Used by [1 function](https://developer.wordpress.org/reference/hooks/get_lastpostmodified/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/get_lastpostmodified/#uses) | Source: [wp-includes/post.php:7615](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7615-L7615) * hook[icon_dir_uri](https://developer.wordpress.org/reference/hooks/icon_dir_uri/) * Filters the icon directory URI. * Used by [1 function](https://developer.wordpress.org/reference/hooks/icon_dir_uri/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/icon_dir_uri/#uses) | Source: [wp-includes/post.php:7238](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7238-L7238) * function[_get_last_post_time()](https://developer.wordpress.org/reference/functions/_get_last_post_time/) * Gets the timestamp of the last time any post was modified or published. * Used by [2 functions](https://developer.wordpress.org/reference/functions/_get_last_post_time/#used-by) | Uses [5 functions](https://developer.wordpress.org/reference/functions/_get_last_post_time/#uses) | Source: [wp-includes/post.php:7633](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7633-L7680) * hook[icon_dirs](https://developer.wordpress.org/reference/hooks/icon_dirs/) * Filters the array of icon directory URIs. * Used by [1 function](https://developer.wordpress.org/reference/hooks/icon_dirs/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/icon_dirs/#uses) | Source: [wp-includes/post.php:7247](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7247-L7247) * function[update_post_cache()](https://developer.wordpress.org/reference/functions/update_post_cache/) * Updates posts in cache. * Used by [4 functions](https://developer.wordpress.org/reference/functions/update_post_cache/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/update_post_cache/#uses) | Source: [wp-includes/post.php:7689](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7689-L7702) * hook[wp_mime_type_icon](https://developer.wordpress.org/reference/hooks/wp_mime_type_icon/) * Filters the mime type icon. * Used by [1 function](https://developer.wordpress.org/reference/hooks/wp_mime_type_icon/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/wp_mime_type_icon/#uses) | Source: [wp-includes/post.php:7324](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7324-L7324) * hook[wp_update_attachment_metadata](https://developer.wordpress.org/reference/hooks/wp_update_attachment_metadata/) * Filters the updated attachment meta data. * Used by [1 function](https://developer.wordpress.org/reference/hooks/wp_update_attachment_metadata/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/wp_update_attachment_metadata/#uses) | Source: [wp-includes/post.php:6952](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6952-L6952) * function[wp_get_attachment_url()](https://developer.wordpress.org/reference/functions/wp_get_attachment_url/) * Retrieves the URL for an attachment. * Used by [38 functions](https://developer.wordpress.org/reference/functions/wp_get_attachment_url/#used-by) | Uses [11 functions](https://developer.wordpress.org/reference/functions/wp_get_attachment_url/#uses) | Source: [wp-includes/post.php:6970](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6970-L7034) * hook[wp_get_attachment_url](https://developer.wordpress.org/reference/hooks/wp_get_attachment_url/) * Filters the attachment URL. * Used by [1 function](https://developer.wordpress.org/reference/hooks/wp_get_attachment_url/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/wp_get_attachment_url/#uses) | Source: [wp-includes/post.php:7027](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7027-L7027) * function[wp_insert_attachment()](https://developer.wordpress.org/reference/functions/wp_insert_attachment/) * Inserts an attachment. * Used by [14 functions](https://developer.wordpress.org/reference/functions/wp_insert_attachment/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/wp_insert_attachment/#uses) | Source: [wp-includes/post.php:6652](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6652-L6667) * function[wp_get_attachment_thumb_url()](https://developer.wordpress.org/reference/functions/wp_get_attachment_thumb_url/) * Retrieves URL for an attachment thumbnail. * Used by [1 function](https://developer.wordpress.org/reference/functions/wp_get_attachment_thumb_url/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/wp_get_attachment_thumb_url/#uses) | Source: [wp-includes/post.php:7078](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7078-L7100) * hook[wp_insert_attachment_data](https://developer.wordpress.org/reference/hooks/wp_insert_attachment_data/) * Filters attachment post data before it is updated in or added to the database. * Used by [1 function](https://developer.wordpress.org/reference/hooks/wp_insert_attachment_data/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/wp_insert_attachment_data/#uses) | Source: [wp-includes/post.php:4871](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L4871-L4871) * hook[wp_get_attachment_thumb_url](https://developer.wordpress.org/reference/hooks/wp_get_attachment_thumb_url/) * Filters the attachment thumbnail URL. * Used by [1 function](https://developer.wordpress.org/reference/hooks/wp_get_attachment_thumb_url/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/wp_get_attachment_thumb_url/#uses) | Source: [wp-includes/post.php:7099](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L7099-L7099) * hook[edit_attachment](https://developer.wordpress.org/reference/hooks/edit_attachment/) * Fires once an existing attachment has been updated. * Used by [1 function](https://developer.wordpress.org/reference/hooks/edit_attachment/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/edit_attachment/#uses) | Source: [wp-includes/post.php:5094](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L5094-L5094) * function[wp_delete_attachment()](https://developer.wordpress.org/reference/functions/wp_delete_attachment/) * Trashes or deletes an attachment. * Used by [4 functions](https://developer.wordpress.org/reference/functions/wp_delete_attachment/#used-by) | Uses [22 functions](https://developer.wordpress.org/reference/functions/wp_delete_attachment/#uses) | Source: [wp-includes/post.php:6688](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6688-L6777) * hook[delete_attachment](https://developer.wordpress.org/reference/hooks/delete_attachment/) * Fires before an attachment is deleted, at the start of wp_delete_attachment(). * Used by [1 function](https://developer.wordpress.org/reference/hooks/delete_attachment/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/delete_attachment/#uses) | Source: [wp-includes/post.php:6741](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6741-L6741) * function[wp_get_attachment_metadata()](https://developer.wordpress.org/reference/functions/wp_get_attachment_metadata/) * Retrieves attachment metadata for attachment ID. * Used by [35 functions](https://developer.wordpress.org/reference/functions/wp_get_attachment_metadata/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/wp_get_attachment_metadata/#uses) | Source: [wp-includes/post.php:6890](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6890-L6922) * hook[wp_get_attachment_metadata](https://developer.wordpress.org/reference/hooks/wp_get_attachment_metadata/) * Filters the attachment meta data. * Used by [1 function](https://developer.wordpress.org/reference/hooks/wp_get_attachment_metadata/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/wp_get_attachment_metadata/#uses) | Source: [wp-includes/post.php:6921](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6921-L6921) * function[wp_update_attachment_metadata()](https://developer.wordpress.org/reference/functions/wp_update_attachment_metadata/) * Updates metadata for an attachment. * Used by [20 functions](https://developer.wordpress.org/reference/functions/wp_update_attachment_metadata/#used-by) | Uses [4 functions](https://developer.wordpress.org/reference/functions/wp_update_attachment_metadata/#uses) | Source: [wp-includes/post.php:6935](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6935-L6958) * function[get_to_ping()](https://developer.wordpress.org/reference/functions/get_to_ping/) * Retrieves URLs that need to be pinged. * Used by [2 functions](https://developer.wordpress.org/reference/functions/get_to_ping/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/get_to_ping/#uses) | Source: [wp-includes/post.php:6045](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6045-L6063) * hook[get_pages](https://developer.wordpress.org/reference/hooks/get_pages/) * Filters the retrieved list of pages. * Used by [1 function](https://developer.wordpress.org/reference/hooks/get_pages/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/get_pages/#uses) | Source: [wp-includes/post.php:6588](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6588-L6588) * hook[get_to_ping](https://developer.wordpress.org/reference/hooks/get_to_ping/) * Filters the list of URLs yet to ping for the given post. * Used by [1 function](https://developer.wordpress.org/reference/hooks/get_to_ping/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/hooks/get_to_ping/#uses) | Source: [wp-includes/post.php:6062](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6062-L6062) * function[is_local_attachment()](https://developer.wordpress.org/reference/functions/is_local_attachment/) * Determines whether an attachment URI is local and really an attachment. * Used by [1 function](https://developer.wordpress.org/reference/functions/is_local_attachment/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/is_local_attachment/#uses) | Source: [wp-includes/post.php:6607](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6607-L6623) * function[trackback_url_list()](https://developer.wordpress.org/reference/functions/trackback_url_list/) * Does trackbacks for a list of URLs. * Used by [0 functions](https://developer.wordpress.org/reference/functions/trackback_url_list/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/trackback_url_list/#uses) | Source: [wp-includes/post.php:6073](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6073-L6091) * function[get_all_page_ids()](https://developer.wordpress.org/reference/functions/get_all_page_ids/) * Gets a list of page IDs. * Used by [0 functions](https://developer.wordpress.org/reference/functions/get_all_page_ids/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/get_all_page_ids/#uses) | Source: [wp-includes/post.php:6106](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L6106-L6116) [Previous Page](https://developer.wordpress.org/reference/files/wp-includes/post.php/page/3/?output_format=md) [1](https://developer.wordpress.org/reference/files/wp-includes/post.php/?output_format=md) [2](https://developer.wordpress.org/reference/files/wp-includes/post.php/page/2/?output_format=md) [3](https://developer.wordpress.org/reference/files/wp-includes/post.php/page/3/?output_format=md) 4 [5](https://developer.wordpress.org/reference/files/wp-includes/post.php/page/5/?output_format=md) [6](https://developer.wordpress.org/reference/files/wp-includes/post.php/page/6/?output_format=md)… 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