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New in WordPress 5.7

Function	Short description	Path
get_post_parent	Retrieves the parent post object for the given post.	wp-includes/post-template.php
has_post_parent	Returns whether the given post has a parent post.	wp-includes/post-template.php
is_post_publicly_viewable	Determine whether a post is publicly viewable.	wp-includes/post.php
is_post_status_viewable	Determine whether a post status is considered "viewable".	wp-includes/post.php
rest_are_values_equal	Checks the equality of two values, following JSON Schema semantics.	wp-includes/rest-api.php
rest_convert_error_to_response	Converts an error to a response object.	wp-includes/rest-api.php
rest_get_authenticated_app_password	Gets the Application Password used for authenticating the request.	wp-includes/rest-api.php
rest_validate_array_value_from_schema	Validates an array value based on a schema.	wp-includes/rest-api.php
rest_validate_boolean_value_from_schema	Validates a boolean value based on a schema.	wp-includes/rest-api.php
rest_validate_enum	Validates that the given value is a member of the JSON Schema "enum".	wp-includes/rest-api.php
rest_validate_integer_value_from_schema	Validates an integer value based on a schema.	wp-includes/rest-api.php
rest_validate_null_value_from_schema	Validates a null value based on a schema.	wp-includes/rest-api.php
rest_validate_number_value_from_schema	Validates a number value based on a schema.	wp-includes/rest-api.php
rest_validate_object_value_from_schema	Validates an object value based on a schema.	wp-includes/rest-api.php
rest_validate_string_value_from_schema	Validates a string value based on a schema.	wp-includes/rest-api.php
wp_ajax_nopriv_generate_password	Ajax handler for generating a password in the no-privilege context.	wp-admin/includes/ajax-actions.php
wp_ajax_send_password_reset	Ajax handler sends a password reset link.	wp-admin/includes/ajax-actions.php
wp_cron_conditionally_prevent_sslverify	Disables SSL verification if the 'cron_request' arguments include an HTTPS URL.	wp-includes/https-detection.php
wp_force_plain_post_permalink	Determine whether post should always use a plain permalink structure.	wp-includes/link-template.php
wp_getimagesize	Allows PHP's getimagesize() to be debuggable when necessary.	wp-includes/media.php
wp_get_default_update_https_url	Gets the default URL to learn more about updating the site to use HTTPS.	wp-includes/functions.php
wp_get_direct_update_https_url	Gets the URL for directly updating the site to use HTTPS.	wp-includes/functions.php
wp_get_inline_script_tag	Wraps inline JavaScript in `<script>` tag.	wp-includes/script-loader.php
wp_get_script_tag	Formats `<script>` loader tags.	wp-includes/script-loader.php
wp_get_update_https_url	Gets the URL to learn more about updating the site to use HTTPS.	wp-includes/functions.php
wp_iframe_tag_add_loading_attr	Adds `loading` attribute to an `iframe` HTML tag.	wp-includes/media.php
wp_is_home_url_using_https	Checks whether the current site URL is using HTTPS.	wp-includes/https-detection.php
wp_is_https_supported	Checks whether HTTPS is supported for the server and domain.	wp-includes/https-detection.php
wp_is_local_html_output	Checks whether a given HTML string is likely an output from this WordPress site.	wp-includes/https-detection.php
wp_is_site_url_using_https	Checks whether the current site's URL where WordPress is stored is using HTTPS.	wp-includes/https-detection.php
wp_is_using_https	Checks whether the website is using HTTPS.	wp-includes/https-detection.php
wp_print_inline_script_tag	Prints inline JavaScript wrapped in `<script>` tag.	wp-includes/script-loader.php
wp_print_script_tag	Prints formatted `<script>` loader tag.	wp-includes/script-loader.php
wp_replace_insecure_home_url	Replaces insecure HTTP URLs to the site in the given content, if configured to do so.	wp-includes/https-migration.php
wp_resolve_post_date	Uses wp_checkdate to return a valid Gregorian-calendar value for post_date.	wp-includes/post.php
wp_robots	Displays the robots meta tag as necessary.	wp-includes/robots-template.php
wp_robots_max_image_preview_large	Adds 'max-image-preview:large' to the robots meta tag.	wp-includes/robots-template.php
wp_robots_noindex	Adds noindex to the robots meta tag if required by the site configuration.	wp-includes/robots-template.php
wp_robots_noindex_embeds	Adds noindex to the robots meta tag for embeds.	wp-includes/robots-template.php
wp_robots_noindex_search	Adds noindex to the robots meta tag if a search is being performed.	wp-includes/robots-template.php
wp_robots_no_robots	Adds noindex to the robots meta tag.	wp-includes/robots-template.php
wp_robots_sensitive_page	Adds noindex and noarchive to the robots meta tag.	wp-includes/robots-template.php
wp_sanitize_script_attributes	Sanitizes an attributes array into an attributes string to be placed inside a `<script>` tag.	wp-includes/script-loader.php
wp_schedule_https_detection	Schedules the Cron hook for detecting HTTPS support.	wp-includes/https-detection.php
wp_should_replace_insecure_home_url	Checks whether WordPress should replace old HTTP URLs to the site with their HTTPS counterpart.	wp-includes/https-migration.php
wp_strict_cross_origin_referrer	Displays a referrer strict-origin-when-cross-origin meta tag.	wp-includes/general-template.php
wp_update_https_detection_errors	Runs a remote HTTPS request to detect whether HTTPS supported, and stores potential errors.	wp-includes/https-detection.php
wp_update_https_migration_required	Updates the 'https_migration_required' option if needed when the given URL has been updated from HTTP to HTTPS.	wp-includes/https-migration.php
wp_update_urls_to_https	Update the 'home' and 'siteurl' option to use the HTTPS variant of their URL.	wp-includes/https-migration.php
_wp_cron	Run scheduled callbacks or spawn cron for all scheduled events.	wp-includes/cron.php