wp_post_insert(): how, what, why?

Transcript

1. wp_insert_post(): How, what and why? Peter Wilson • @pwcc • peterwilson.cc
2. 1 /** 2 * Insert or update a post. 3 * 4 * If the $postarr parameter has 'ID' set to a value, then post will be updated. 5 * 6 * You can set the post date manually, by setting the values for 'post_date' 7 * and 'post_date_gmt' keys. You can close the comments or open the comments by 8 * setting the value for 'comment_status' key. 9 * 10 * @since 1.0.0 11 * @since 4.2.0 Support was added for encoding emoji in the post title, content, and excerpt. 12 * @since 4.4.0 A 'meta_input' array can now be passed to `$postarr` to add post meta data.t 13 * 14 * @see sanitize_post() 15 * @global wpdb $wpdb WordPress database abstraction object. 16 * 17 * @param array $postarr { 18 * An array of elements that make up a post to update or insert. 19 * 20 * @type int $ID The post ID. If equal to something other than 0, 21 * the post with that ID will be updated. Default 0. 22 * @type int $post_author The ID of the user who added the post. Default is 23 * the current user ID. 24 * @type string $post_date The date of the post. Default is the current time. 25 * @type string $post_date_gmt The date of the post in the GMT timezone. Default is 26 * the value of `$post_date`. 27 * @type mixed $post_content The post content. Default empty. 28 * @type string $post_content_filtered The filtered post content. Default empty. 29 * @type string $post_title The post title. Default empty. 30 * @type string $post_excerpt The post excerpt. Default empty. 31 * @type string $post_status The post status. Default 'draft'. 32 * @type string $post_type The post type. Default 'post'. 33 * @type string $comment_status Whether the post can accept comments. Accepts 'open' or 'closed'. 34 * Default is the value of 'default_comment_status' option. 35 * @type string $ping_status Whether the post can accept pings. Accepts 'open' or 'closed'. 36 * Default is the value of 'default_ping_status' option. 37 * @type string $post_password The password to access the post. Default empty. 38 * @type string $post_name The post name. Default is the sanitized post title 39 * when creating a new post. 40 * @type string $to_ping Space or carriage return-separated list of URLs to ping. 41 * Default empty.
4. 598 do_action( 'save_post', $post_ID, $post, $upda 599 600 /** 601 * Fires once a post has been saved. 602 * 603 * @since 2.0.0 604 * 605 * @param int $post_ID Post ID. 606 * @param WP_Post $post Post object. 607 * @param bool $update Whether this is an 608 */ 609 do_action( 'wp_insert_post', $post_ID, $post, 610 611 return $post_ID; 612 }
5. php > var_dump( PHP_INT_MAX );
6. php > var_dump( PHP_INT_MAX ); int(9223372036854775807)

7. php > var_dump( PHP_INT_MAX ); int(9223372036854775807)
 php > var_dump( 18446744073709551615 );
8. php > var_dump( PHP_INT_MAX ); int(9223372036854775807)
 php > var_dump( 18446744073709551615 ); float(1.844674407371E+19)

9. php > var_dump( PHP_INT_MAX ); int(9223372036854775807)
 php > var_dump( 18446744073709551615 ); float(1.844674407371E+19)
 php > var_dump( 18446744073709551615 > PHP_INT_MAX );
10. php > var_dump( PHP_INT_MAX ); int(9223372036854775807)
 php > var_dump( 18446744073709551615 ); float(1.844674407371E+19)
 php > var_dump( 18446744073709551615 > PHP_INT_MAX ); bool(true)

11. php > var_dump( PHP_INT_MAX ); int(9223372036854775807)
 php > var_dump( 18446744073709551615 ); float(1.844674407371E+19)
 php > var_dump( 18446744073709551615 > PHP_INT_MAX ); bool(true)
 php > var_dump( (int) 18446744073709551615 );
12. php > var_dump( PHP_INT_MAX ); int(9223372036854775807)
 php > var_dump( 18446744073709551615 ); float(1.844674407371E+19)
 php > var_dump( 18446744073709551615 > PHP_INT_MAX ); bool(true)
 php > var_dump( (int) 18446744073709551615 ); int(0)
13. /** * Update a post with new post data. * * The date does not have to be set for drafts. You can set the date and it will * not be overridden. * * @since 1.0.0 * * @param array|object $postarr Optional. Post data. Arrays are expected to be escaped, * objects are not. Default array. * @param bool $wp_error Optional. Allow return of WP_Error on failure. Default false. * @return int|WP_Error The value 0 or WP_Error on failure. The post ID on success. */ function wp_update_post( $postarr = array(), $wp_error = false ) { // Logic Checks. // Smart Defaults return wp_insert_post( $postarr, $wp_error ); }
14. /** * Update a post with new post data. * * The date does not have to be set for drafts. You can set the date and it will * not be overridden. * * @since 1.0.0 * * @param array|object $postarr Optional. Post data. Arrays are expected to be escaped, * objects are not. Default array. * @param bool $wp_error Optional. Allow return of WP_Error on failure. Default false. * @return int|WP_Error The value 0 or WP_Error on failure. The post ID on success. */ function wp_update_post( $postarr = array(), $wp_error = false ) { // Logic Checks. // Smart Defaults return wp_insert_post( $postarr, $wp_error ); } // First, get all of the original fields. $post = get_post( $postarr['ID'], ARRAY_A ); if ( is_null( $post ) ) { /* ... */ return 0; }
15. /** * Update a post with new post data. * * The date does not have to be set for drafts. You can set the date and it will * not be overridden. * * @since 1.0.0 * * @param array|object $postarr Optional. Post data. Arrays are expected to be escaped, * objects are not. Default array. * @param bool $wp_error Optional. Allow return of WP_Error on failure. Default false. * @return int|WP_Error The value 0 or WP_Error on failure. The post ID on success. */ function wp_update_post( $postarr = array(), $wp_error = false ) { // Logic Checks. // Smart Defaults return wp_insert_post( $postarr, $wp_error ); } // First, get all of the original fields. $post = get_post( $postarr['ID'], ARRAY_A ); if ( is_null( $post ) ) { /* ... */ return 0; }
16. Permission checks wp_insert_post() skips them.
17. if ( current_user_can( 'edit_posts' ) ) { wp_insert_post( [] ); }
18. /* if ( current_user_can( 'edit_posts' ) ) { */ wp_insert_post( [] ); }
19. $post_type_object = get_post_type_object( 'post' ); if ( current_user_can( $post_type_object->cap->create_posts ) ) { /* if ( current_user_can( 'edit_posts' ) ) { */ wp_insert_post( [] ); }
20. $post_type_object = get_post_type_object( 'post' ); if ( current_user_can( $post_type_object->cap->create_posts ) ) { /* if ( current_user_can( 'edit_posts' ) ) { */ wp_insert_post( [] ); }
21. $post_type_object = get_post_type_object( 'post' ); if ( current_user_can( $post_type_object->cap->create_posts ) ) { /* if ( current_user_can( 'edit_posts' ) ) { */ wp_insert_post( [] ); }
22. $post_type_object = get_post_type_object( 'slide_deck' ); if ( current_user_can( $post_type_object->cap->create_posts ) ) { /* if ( current_user_can( 'edit_slide_decks' ) ) { */ wp_insert_post( [] ); }
23. $post_type_object = get_post_type_object( 'slide_deck' ); if ( current_user_can( $post_type_object->cap->create_posts ) ) { /* if ( current_user_can( 'create_slide_decks' ) ) { */ wp_insert_post( [] ); }
24. if ( current_user_can( 'edit_post', $post_id ) ) { wp_insert_post( [] ); }
25. $post_type_object = get_post_type_object( 'post' ); if ( current_user_can( $post_type_object->cap->edit_post, $post_id ) ) { /* if ( current_user_can( 'edit_post', $post_id ) ) { */ wp_insert_post( [] ); }
26. // Don't allow contributors to set the // post slug for pending review posts. if ( 'pending' == $post_status && ! current_user_can( 'publish_posts' ) ) { $post_name = ''; }
27. In the beginning
28. function wp_insert_post( $postarr, $wp_error = false ) { global $wpdb; $user_id = get_current_user_id(); $defaults = array( 'post_author' => $user_id, 'post_content' => '', 'post_content_filtered' => '', 'post_title' => '', 'post_excerpt' => '', 'post_status' => 'draft', 'post_type' => 'post', 'comment_status' => '', 'ping_status' => '', 'post_password' => '', 'to_ping' => '', 'pinged' => '', 'post_parent' => 0, 'menu_order' => 0, 'guid' => '', 'import_id' => 0, 'context' => '', ); $postarr = wp_parse_args( $postarr, $defaults ); unset( $postarr['filter'] );
29. $postarr = wp_parse_args( $postarr, $defaults ); unset( $postarr['filter'] ); $postarr = sanitize_post( $postarr, 'db' ); // Are we updating or creating? $post_ID = 0; $update = false; $guid = $postarr['guid']; if ( ! empty( $postarr['ID'] ) ) { $update = true; // Get the post ID and GUID. $post_ID = $postarr['ID']; $post_before = get_post( $post_ID ); if ( is_null( $post_before ) ) { if ( $wp_error ) { return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) ); } return 0; } $guid = get_post_field( 'guid', $post_ID ); $previous_status = get_post_field( 'post_status', $post_ID ); } else { $previous_status = 'new'; }
30. $postarr = wp_parse_args( $postarr, $defaults ); unset( $postarr['filter'] ); $postarr = sanitize_post( $postarr, 'db' ); // Are we updating or creating? $post_ID = 0; $update = false; $guid = $postarr['guid']; if ( ! empty( $postarr['ID'] ) ) { $update = true; // Get the post ID and GUID. $post_ID = $postarr['ID']; $post_before = get_post( $post_ID ); if ( is_null( $post_before ) ) { if ( $wp_error ) { return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) ); } return 0; } $guid = get_post_field( 'guid', $post_ID ); $previous_status = get_post_field( 'post_status', $post_ID ); } else { $previous_status = 'new'; } oring
31. /** * Filters slashed post data just before it is inserted into * the database. * * @since 2.7.0 * * @param array $data An array of slashed post data. * @param array $postarr An array of sanitized, but * otherwise unmodified post data. */ $data = apply_filters( 'wp_insert_post_data', $data, $postarr );
32. /** * Filters slashed post data just before it is inserted into * the database. * * @since 2.7.0 * * @param array $data An array of slashed post data. * @param array $postarr An array of sanitized, but * otherwise unmodified post data. */ $data = apply_filters( 'wp_insert_post_data', $data, $postarr );
33. /** * Filters slashed post data just before it is inserted into * the database. * * @since 2.7.0 * * @param array $data An array of slashed post data. * @param array $postarr An array of sanitized, but * otherwise unmodified post data. */ $data = apply_filters( 'wp_insert_post_data', $data, $postarr );
34. /** * Add "sincerely, -me" to the end of each post before saving. * * @param array $data An array of slashed post data. * @return array A modified array of slashed post data. */ function add_evan_hansen_reference( $data ) { $data = wp_unslash( $data ); $data['post_content'] .= "\n\nsincerely,\n-me"; return wp_slash( $data ); } add_filter( 'wp_insert_post_data', 'add_evan_hansen_reference' );
35. /** * Add "sincerely, -me" to the end of each post before saving. * * @param array $data An array of slashed post data. * @return array A modified array of slashed post data. */ function add_evan_hansen_reference( $data ) { $data = wp_unslash( $data ); $data['post_content'] .= "\n\nsincerely,\n-me"; return wp_slash( $data ); } add_filter( 'wp_insert_post_data', 'add_evan_hansen_reference' );
36. /** * Add "sincerely, -me" to the end of each post before saving. * * @param array $data An array of slashed post data. * @return array A modified array of slashed post data. */ function add_evan_hansen_reference( $data ) { $data = wp_unslash( $data ); $data['post_content'] .= "\n\nsincerely,\n-me"; return wp_slash( $data ); } add_filter( 'wp_insert_post_data', 'add_evan_hansen_reference' );
37. /** * Add "sincerely, -me" to the end of each post before saving. * * @param array $data An array of slashed post data. * @return array A modified array of slashed post data. */ function add_evan_hansen_reference( $data ) { $data = wp_unslash( $data ); $data['post_content'] .= "\n\nsincerely,\n-me"; return wp_slash( $data ); } add_filter( 'wp_insert_post_data', 'add_evan_hansen_reference' );
38. return wp_slash( $data );
39. $data = wp_slash( $data ); return $data;
40. $data = wp_slash( $data ); $data['post_title'] .= " ¯\_(ϑ)_/¯"; return $data;
41. $data = wp_slash( $data ); $data['post_title'] .= " ¯\_(ϑ)_/¯"; return $data;
42. $data = wp_slash( $data ); return $data;
43. return wp_slash( $data );
44. $data['post_title'] .= " ¯\_(ϑ)_/¯”; return wp_slash( $data );
45. echo esc_url( $data );
46. /** * Filters slashed post data just before it is inserted into * the database. * * @since 2.7.0 * * @param array $data An array of slashed post data. * @param array $postarr An array of sanitized, but * otherwise unmodified post data. */ $data = apply_filters( 'wp_insert_post_data', $data, $postarr );
47. if ( $update ) { /** * Fires immediately before an existing post is updated in the database. * * @since 2.5.0 * * @param int $post_ID Post ID. * @param array $data Array of unslashed post data. */ do_action( 'pre_post_update', $post_ID, $data ); if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) { if ( $wp_error ) { return new WP_Error( 'db_update_error', __( 'Could not update post in the } else { return 0; } } } else { // If there is a suggested ID, use it if not already present. if ( ! empty( $import_id ) ) { $import_id = (int) $import_id; if ( ! $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE ID
48. * * @param int $post_ID Post ID. * @param array $data Array of unslashed post data. */ do_action( 'pre_post_update', $post_ID, $data ); if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) { if ( $wp_error ) { return new WP_Error( 'db_update_error', __( 'Could not update post in the } else { return 0; } } } else { // If there is a suggested ID, use it if not already present. if ( ! empty( $import_id ) ) { $import_id = (int) $import_id; if ( ! $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE ID $data['ID'] = $import_id; } } if ( false === $wpdb->insert( $wpdb->posts, $data ) ) { if ( $wp_error ) { return new WP_Error( 'db_insert_error', __( 'Could not insert post into th } else {
49. /** * Filters slashed post data just before it is inserted into * the database. * * @since 2.7.0 * * @param array $data An array of slashed post data. * @param array $postarr An array of sanitized, but * otherwise unmodified post data. */ $data = apply_filters( 'wp_insert_post_data', $data, $postarr );
50. if ( is_object_in_taxonomy( $post_type, 'category' ) ) { wp_set_post_categories( $post_ID, $post_category ); } if ( isset( $postarr['tags_input'] ) && is_object_in_taxonomy( $post_type, 'post_tag' ) ) { wp_set_post_tags( $post_ID, $postarr['tags_input'] ); }
51. wp_set_post_categories( $post_ID, $post_category ); wp_set_post_tags( $post_ID, $postarr['tags_input'] );
52. /** * Set the terms for a post. * * @since 2.8.0 * * @see wp_set_object_terms() * * @param int $post_id Optional. The Post ID. * Does not default to the ID of the global $post. * @param string|array $tags Optional. An array of terms to set for the post, or a * string of terms separated by commas. Default empty. * @param string $taxonomy Optional. Taxonomy name. Default 'post_tag'. * @param bool $append Optional. If true, don't delete existing terms, just add on. * If false, replace the terms with the new terms. Default false. * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. * WP_Error or false on failure. */ function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) { }
53. /** * Create Term and Taxonomy Relationships. * * Relates an object (post, link etc) to a term and taxonomy type. Creates the * term and taxonomy relationship if it doesn't already exist. Creates a term if * it doesn't exist (using the slug). * * A relationship means that the term is grouped in or belongs to the taxonomy. * A term has no meaning until it is given context by defining which taxonomy it * exists under. * * @since 2.3.0 * * @global wpdb $wpdb The WordPress database abstraction object. * * @param int $object_id The object to relate to. * @param string|int|array $terms A single term slug, single term id, or array of * either term slugs or ids. Will replace all existing * related terms in this taxonomy. Passing an empty * value will remove all related terms. * @param string $taxonomy The context in which to relate the term to * the object. * @param bool $append Optional. If false will delete difference of terms. * Default false. * @return array|WP_Error Term taxonomy IDs of the affected terms. */ function wp_set_object_terms( $object_id, $terms, $taxonomy, $append = false ) { }
54. wp_set_post_categories( $post_ID, $post_category )
55. if ( 'post' == $post_type && 'auto-draft' != $post_status ) { $post_categories = array( get_option('default_category') ); $append = false; } else { $post_categories = array(); }
56. function wp_set_post_tags( $post_id = 0, $tags = '', $append = false ) { return wp_set_post_terms( $post_id, $tags, 'post_tag', $append); }
57. /** * Set the terms for a post. * * @since 2.8.0 * * @see wp_set_object_terms() * * @param int $post_id Optional. The Post ID. * Does not default to the ID of the global $post. * @param string|array $tags Optional. An array of terms to set for the post, or a * string of terms separated by commas. Default empty. * @param string $taxonomy Optional. Taxonomy name. Default 'post_tag'. * @param bool $append Optional. If true, don't delete existing terms, just add on. * If false, replace the terms with the new terms. Default false. * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. * WP_Error or false on failure. */ function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) { }
58. Non-hierarchical taxonomy (eg tags) wp_set_post_terms( 12, // Post ID. [ 'apple', 'microsoft' ],// Terms (slugs). 'post_tag' // Taxonomy. );
59. Non-hierarchical taxonomy (eg tags) wp_set_post_terms( 12, // Post ID. [ 12, 120 ], // Terms (IDs). 'post_tag' // Taxonomy. );
60. Non-hierarchical taxonomy (eg tags) wp_set_post_terms( 12, // Post ID. [ 'apple', 'microsoft' ],// Terms (slugs). 'post_tag' // Taxonomy. );
61. Hierarchical taxonomy (eg categories)
62. Categories • Phones • Android • Apple • Laptops • Apple • Microsoft
63. Categories • Phones (phones) • Android (android) • Apple (apple) • Laptops (laptop) • Apple (apple) • Microsoft (microsoft)
64. Hierarchical taxonomy (eg categories) wp_set_post_terms( 12, // Post ID. [ 'apple', 'microsoft' ],// Terms (slugs). 'category' // Taxonomy. );
65. Hierarchical taxonomy (eg categories) wp_set_post_terms( 12, // Post ID. [ 12, 120 ], // Terms (IDs). 'category' // Taxonomy. );
66. /** * Set the terms for a post. * * @since 2.8.0 * * @see wp_set_object_terms() * * @param int $post_id Optional. The Post ID. * Does not default to the ID of the global $post. * @param string|array $tags Optional. An array of terms to set for the post, or a * string of terms separated by commas. Default empty. * @param string $taxonomy Optional. Taxonomy name. Default 'post_tag'. * @param bool $append Optional. If true, don't delete existing terms, just add on. * If false, replace the terms with the new terms. Default false. * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. * WP_Error or false on failure. */ function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) { }
67. /* * Hierarchical taxonomies must always pass IDs rather * than names so that children with the same names but * different parents aren't confused. */ if ( is_taxonomy_hierarchical( $taxonomy ) ) { $tags = array_unique( array_map( 'intval', $tags ) ); }
68. /** * Create Term and Taxonomy Relationships. * * Relates an object (post, link etc) to a term and taxonomy type. Creates the * term and taxonomy relationship if it doesn't already exist. Creates a term if * it doesn't exist (using the slug). * * A relationship means that the term is grouped in or belongs to the taxonomy. * A term has no meaning until it is given context by defining which taxonomy it * exists under. * * @since 2.3.0 * * @global wpdb $wpdb The WordPress database abstraction object. * * @param int $object_id The object to relate to. * @param string|int|array $terms A single term slug, single term id, or array of * either term slugs or ids. Will replace all existing * related terms in this taxonomy. Passing an empty * value will remove all related terms. * @param string $taxonomy The context in which to relate the term to * the object. * @param bool $append Optional. If false will delete difference of terms. * Default false. * @return array|WP_Error Term taxonomy IDs of the affected terms. */ function wp_set_object_terms( $object_id, $terms, $taxonomy, $append = false ) { }
69. /** * Create Term and Taxonomy Relationships. * * Relates an object (post, link etc) to a term and taxonomy type. Creates the * term and taxonomy relationship if it doesn't already exist. Creates a term if * it doesn't exist (using the slug). * * A relationship means that the term is grouped in or belongs to the taxonomy. * A term has no meaning until it is given context by defining which taxonomy it * exists under. * * @since 2.3.0 * * @global wpdb $wpdb The WordPress database abstraction object. * * @param int $object_id The object to relate to. * @param string|int|array $terms A single term slug, single term id, or array of * either term slugs or ids. Will replace all existing * related terms in this taxonomy. Passing an empty * value will remove all related terms. * @param string $taxonomy The context in which to relate the term to * the object. * @param bool $append Optional. If false will delete difference of terms. * Default false. * @return array|WP_Error Term taxonomy IDs of the affected terms. */ function wp_set_object_terms( $object_id, $terms, $taxonomy, $append = false ) { } Fascinating
 but way, way, way beyond the scope f this talk
70. // New-style support for all custom taxonomies. foreach ( $postarr['tax_input'] as $taxonomy => $tags ) { $taxonomy_obj = get_taxonomy( $taxonomy ); if ( ! $taxonomy_obj ) { _doing_it_wrong( /* snip */ ); continue; } // array = hierarchical, string = non-hierarchical. if ( is_array( $tags ) ) { $tags = array_filter( $tags ); } if ( current_user_can( $taxonomy_obj->cap->assign_terms ) ) { wp_set_post_terms( $post_ID, $tags, $taxonomy ); } }
71. // New-style support for all custom taxonomies. foreach ( $postarr['tax_input'] as $taxonomy => $tags ) { $taxonomy_obj = get_taxonomy( $taxonomy ); if ( ! $taxonomy_obj ) { _doing_it_wrong( /* snip */ ); continue; } // array = hierarchical, string = non-hierarchical. if ( is_array( $tags ) ) { $tags = array_filter( $tags ); } if ( current_user_can( $taxonomy_obj->cap->assign_terms ) ) { wp_set_post_terms( $post_ID, $tags, $taxonomy ); } }
72. // New-style support for all custom taxonomies. foreach ( $postarr['tax_input'] as $taxonomy => $tags ) { $taxonomy_obj = get_taxonomy( $taxonomy ); if ( ! $taxonomy_obj ) { _doing_it_wrong( /* snip */ ); continue; } // array = hierarchical, string = non-hierarchical. if ( is_array( $tags ) ) { $tags = array_filter( $tags ); } if ( current_user_can( $taxonomy_obj->cap->assign_terms ) ) { wp_set_post_terms( $post_ID, $tags, $taxonomy ); } }
73. Post meta
74. wp_insert_post( [ 'post_type' => 'musical', 'post_title' => 'Dear Evan Hansen', 'meta_input' => [ 'Male lead' => 'Ben Platt', 'Female lead' => 'Laura Dreyfuss', ], ] );
75. if ( ! empty( $postarr['meta_input'] ) ) { foreach ( $postarr['meta_input'] as $field => $value ) { update_post_meta( $post_ID, $field, $value ); } }
76. update_post_meta( $post_ID, 'Male Lead', 'Ben Platt', ‘Ben Platt' ); update_post_meta( $post_ID, 'Male Lead', 'Noah Galvin', 'Noah Galvin' ); update_post_meta( $post_ID, 'Male Lead', 'Taylor Trensch', 'Taylor Trensch' );
77. /** * Update metadata for the specified object. If no value already exists for the specified object * ID and metadata key, the metadata will be added. * * @since 2.9.0 * * @global wpdb $wpdb WordPress database abstraction object. * * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user) * @param int $object_id ID of the object metadata is for * @param string $meta_key Metadata key * @param mixed $meta_value Metadata value. Must be serializable if non-scalar. * @param mixed $prev_value Optional. If specified, only update existing metadata
 * entries with the specified value. Otherwise, update all entries. * @return int|bool Meta ID if the key didn't exist, true on successful update, 
 *. false on failure. */ function update_metadata($meta_type, $object_id, $meta_key, $meta_value, $prev_value = '') {
78. /** * Filters whether to update metadata of a specific type. * * The dynamic portion of the hook, `$meta_type`, refers to the meta * object type (comment, post, or user). Returning a non-null value * will effectively short-circuit the function. * * @since 3.1.0 * * @param null|bool $check Whether to allow updating metadata for the * given type. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. Must be serializable if non-scalar. * @param mixed $prev_value Optional. If specified, only update existing * metadata entries with the specified value. * Otherwise, update all entries. */ $check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value ); if ( null !== $check ) { return (bool) $check; }
79. /** * Filters whether to update metadata of a specific type. * * The dynamic portion of the hook, `$meta_type`, refers to the meta * object type (comment, post, or user). Returning a non-null value * will effectively short-circuit the function. * * @since 3.1.0 * * @param null|bool $check Whether to allow updating metadata for the * given type. * @param int $object_id Object ID. * @param string $meta_key Meta key. * @param mixed $meta_value Meta value. Must be serializable if non-scalar. * @param mixed $prev_value Optional. If specified, only update existing * metadata entries with the specified value. * Otherwise, update all entries. */ $check = apply_filters( "update_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $prev_value ); if ( null !== $check ) { return (bool) $check; } "update_post_metadata",
80. <?php function pw_update_meta_filter( $check ) { // Coin toss. if ( rand( 0, 1 ) ) { // Allow function to run. return null; } // Do not allow function to run. return false; } add_filter( 'update_post_metadata', 'pw_update_meta_filter' );
81. <?php function pw_update_meta_filter( $check ) { // Coin toss. if ( rand( 0, 1 ) ) { // Allow function to run. return null; } // Do not allow function to run. return false; } add_filter( 'update_post_metadata', 'pw_update_meta_filter' );
82. <?php function pw_update_meta_filter( $check ) { // Coin toss. if ( rand( 0, 1 ) ) { // Allow function to run. return null; } // Do not allow function to run. return false; } add_filter( 'update_post_metadata', 'pw_update_meta_filter' );
83. <?php function pw_update_meta_filter( $check ) { // Coin toss. if ( rand( 0, 1 ) ) { // Allow function to run. return null; } // Do not allow function to run. return false; } add_filter( 'update_post_metadata', 'pw_update_meta_filter' );
84. <?php function pw_update_meta_filter( $check, $post_id, $meta_key, $meta_value ) { // Check if ( 'Male Lead' !== $meta_key ) { // Allow function to run. return null; } // Do not allow function to run. pw_call_custom_functionality( $post_id, $meta_key, $meta_value ); return false; } add_filter( 'update_post_metadata', 'pw_update_meta_filter', 10, 4 );
85. <?php function pw_update_meta_filter( $check, $post_id, $meta_key, $meta_value ) { // Check if ( 'Male Lead' !== $meta_key ) { // Allow function to run. return null; } // Do not allow function to run. pw_call_custom_functionality( $post_id, $meta_key, $meta_value ); return false; } add_filter( 'update_post_metadata', 'pw_update_meta_filter', 10, 4 );
86. <?php function pw_update_meta_filter( $check, $post_id, $meta_key, $meta_value ) { // Check if ( 'Male Lead' !== $meta_key ) { // Allow function to run. return null; } // Do not allow function to run. pw_call_custom_functionality( $post_id, $meta_key, $meta_value ); return false; } add_filter( 'update_post_metadata', 'pw_update_meta_filter', 10, 4 );
87. <?php function pw_update_meta_filter( $check, $post_id, $meta_key, $meta_value ) { // Check if ( 'Male Lead' !== $meta_key ) { // Allow function to run. return $check; } // Do not allow function to run. pw_call_custom_functionality( $post_id, $meta_key, $meta_value ); return false; } add_filter( 'update_post_metadata', 'pw_update_meta_filter', 10, 4 );
88. Wrapping up Actions and filters
89. if ( $update ) { do_action( 'edit_post', $post_ID, $post ); $post_after = get_post( $post_ID ); do_action( 'post_updated', $post_ID, $post_after, $post_before ); } Post revision saved.
90. do_action( "save_post_{$post->post_type}", $post_ID, $post, $update ); do_action( 'save_post', $post_ID, $post, $update ); do_action( 'wp_insert_post', $post_ID, $post, $update );
91. return $postID; }
92. return $postID; } // Any Questions?