Title: Functions | Page 38 of 49 | Developer.WordPress.org --- # Functions * function[is_paged()](https://developer.wordpress.org/reference/functions/is_paged/) * Determines whether the query is for a paged result and not for the first page. * Used by [5 functions](https://developer.wordpress.org/reference/functions/is_paged/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/is_paged/#uses) | Source: [wp-includes/query.php:608](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/query.php#L608-L617) * function[is_page_template()](https://developer.wordpress.org/reference/functions/is_page_template/) * Determines whether the current post uses a page template. * Used by [1 function](https://developer.wordpress.org/reference/functions/is_page_template/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/is_page_template/#uses) | Source: [wp-includes/post-template.php:1851](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post-template.php#L1851-L1875) * function[is_php_version_compatible()](https://developer.wordpress.org/reference/functions/is_php_version_compatible/) * Checks compatibility with the current PHP version. * Used by [18 functions](https://developer.wordpress.org/reference/functions/is_php_version_compatible/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/is_php_version_compatible/#uses) | Source: [wp-includes/functions.php:8986](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/functions.php#L8986-L8988) * function[is_plugin_active()](https://developer.wordpress.org/reference/functions/is_plugin_active/) * Determines whether a plugin is active. * Used by [26 functions](https://developer.wordpress.org/reference/functions/is_plugin_active/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/is_plugin_active/#uses) | Source: [wp-admin/includes/plugin.php:539](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/plugin.php#L539-L541) * function[is_plugin_active_for_network()](https://developer.wordpress.org/reference/functions/is_plugin_active_for_network/) * Determines whether the plugin is active for the entire network. * Used by [8 functions](https://developer.wordpress.org/reference/functions/is_plugin_active_for_network/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/is_plugin_active_for_network/#uses) | Source: [wp-admin/includes/plugin.php:580](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/plugin.php#L580-L591) * function[is_plugin_inactive()](https://developer.wordpress.org/reference/functions/is_plugin_inactive/) * Determines whether the plugin is inactive. * Used by [7 functions](https://developer.wordpress.org/reference/functions/is_plugin_inactive/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/is_plugin_inactive/#uses) | Source: [wp-admin/includes/plugin.php:559](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/plugin.php#L559-L561) * function[is_plugin_page()](https://developer.wordpress.org/reference/functions/is_plugin_page/) * Determines whether the current admin page is generated by a plugin. * Used by [0 functions](https://developer.wordpress.org/reference/functions/is_plugin_page/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/is_plugin_page/#uses) | Source: [wp-includes/deprecated.php:2540](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/deprecated.php#L2540-L2549) * function[is_plugin_paused()](https://developer.wordpress.org/reference/functions/is_plugin_paused/) * Determines whether a plugin is technically active but was paused while loading. * Used by [2 functions](https://developer.wordpress.org/reference/functions/is_plugin_paused/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/is_plugin_paused/#uses) | Source: [wp-admin/includes/plugin.php:2476](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/plugin.php#L2476-L2488) * function[is_post_embeddable()](https://developer.wordpress.org/reference/functions/is_post_embeddable/) * Determines whether a post is embeddable. * Used by [2 functions](https://developer.wordpress.org/reference/functions/is_post_embeddable/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/is_post_embeddable/#uses) | Source: [wp-includes/post.php:2529](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L2529-L2553) * function[is_post_publicly_viewable()](https://developer.wordpress.org/reference/functions/is_post_publicly_viewable/) * Determines whether a post is publicly viewable. * Used by [6 functions](https://developer.wordpress.org/reference/functions/is_post_publicly_viewable/#used-by) | Uses [5 functions](https://developer.wordpress.org/reference/functions/is_post_publicly_viewable/#uses) | Source: [wp-includes/post.php:2508](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L2508-L2519) * function[is_post_status_viewable()](https://developer.wordpress.org/reference/functions/is_post_status_viewable/) * Determines whether a post status is considered “viewable”. * Used by [2 functions](https://developer.wordpress.org/reference/functions/is_post_status_viewable/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/is_post_status_viewable/#uses) | Source: [wp-includes/post.php:2457](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L2457-L2495) * function[is_post_type_archive()](https://developer.wordpress.org/reference/functions/is_post_type_archive/) * Determines whether the query is for an existing post type archive page. * Used by [9 functions](https://developer.wordpress.org/reference/functions/is_post_type_archive/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/is_post_type_archive/#uses) | Source: [wp-includes/query.php:187](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/query.php#L187-L196) * function[is_post_type_hierarchical()](https://developer.wordpress.org/reference/functions/is_post_type_hierarchical/) * Determines whether the post type is hierarchical. * Used by [18 functions](https://developer.wordpress.org/reference/functions/is_post_type_hierarchical/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/is_post_type_hierarchical/#uses) | Source: [wp-includes/post.php:1560](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L1560-L1567) * function[is_post_type_viewable()](https://developer.wordpress.org/reference/functions/is_post_type_viewable/) * Determines whether a post type is considered “viewable”. * Used by [14 functions](https://developer.wordpress.org/reference/functions/is_post_type_viewable/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/is_post_type_viewable/#uses) | Source: [wp-includes/post.php:2413](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/post.php#L2413-L2443) * function[is_preview()](https://developer.wordpress.org/reference/functions/is_preview/) * Determines whether the query is for a post or page preview. * Used by [3 functions](https://developer.wordpress.org/reference/functions/is_preview/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/is_preview/#uses) | Source: [wp-includes/query.php:632](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/query.php#L632-L641) * function[is_privacy_policy()](https://developer.wordpress.org/reference/functions/is_privacy_policy/) * Determines whether the query is for the Privacy Policy page. * Used by [1 function](https://developer.wordpress.org/reference/functions/is_privacy_policy/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/is_privacy_policy/#uses) | Source: [wp-includes/query.php:529](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/query.php#L529-L538) * function[is_protected_ajax_action()](https://developer.wordpress.org/reference/functions/is_protected_ajax_action/) * Determines whether we are currently handling an Ajax action that should be protected against WSODs. * Used by [1 function](https://developer.wordpress.org/reference/functions/is_protected_ajax_action/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/is_protected_ajax_action/#uses) | Source: [wp-includes/load.php:1218](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/load.php#L1218-L1255) * function[is_protected_endpoint()](https://developer.wordpress.org/reference/functions/is_protected_endpoint/) * Determines whether we are currently on an endpoint that should be protected against WSODs. * Used by [2 functions](https://developer.wordpress.org/reference/functions/is_protected_endpoint/#used-by) | Uses [4 functions](https://developer.wordpress.org/reference/functions/is_protected_endpoint/#uses) | Source: [wp-includes/load.php:1180](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/load.php#L1180-L1209) * function[is_protected_meta()](https://developer.wordpress.org/reference/functions/is_protected_meta/) * Determines whether a meta key is considered protected. * Used by [11 functions](https://developer.wordpress.org/reference/functions/is_protected_meta/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/is_protected_meta/#uses) | Source: [wp-includes/meta.php:1316](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/meta.php#L1316-L1331) * function[is_random_header_image()](https://developer.wordpress.org/reference/functions/is_random_header_image/) * Checks if random header image is in use. * Used by [4 functions](https://developer.wordpress.org/reference/functions/is_random_header_image/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/is_random_header_image/#uses) | Source: [wp-includes/theme.php:1470](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/theme.php#L1470-L1491) * function[is_redirect()](https://developer.wordpress.org/reference/functions/is_redirect/) * Used by [0 functions](https://developer.wordpress.org/reference/functions/is_redirect/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/is_redirect/#uses) | Source: [wp-includes/rss.php:702](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/rss.php#L702-L704) * function[is_registered_sidebar()](https://developer.wordpress.org/reference/functions/is_registered_sidebar/) * Checks if a sidebar is registered. * Used by [6 functions](https://developer.wordpress.org/reference/functions/is_registered_sidebar/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/is_registered_sidebar/#uses) | Source: [wp-includes/widgets.php:357](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/widgets.php#L357-L361) * function[is_robots()](https://developer.wordpress.org/reference/functions/is_robots/) * Is the query for the robots.txt file? * Used by [2 functions](https://developer.wordpress.org/reference/functions/is_robots/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/is_robots/#uses) | Source: [wp-includes/query.php:652](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/query.php#L652-L661) * function[is_rtl()](https://developer.wordpress.org/reference/functions/is_rtl/) * Determines whether the current locale is right-to-left (RTL). * Used by [20 functions](https://developer.wordpress.org/reference/functions/is_rtl/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/is_rtl/#uses) | Source: [wp-includes/l10n.php:1817](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/l10n.php#L1817-L1823) * function[is_search()](https://developer.wordpress.org/reference/functions/is_search/) * Determines whether the query is for a search. * Used by [7 functions](https://developer.wordpress.org/reference/functions/is_search/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/is_search/#uses) | Source: [wp-includes/query.php:696](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/query.php#L696-L705) * function[is_serialized()](https://developer.wordpress.org/reference/functions/is_serialized/) * Checks value to find if it was serialized. * Used by [5 functions](https://developer.wordpress.org/reference/functions/is_serialized/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/is_serialized/#uses) | Source: [wp-includes/functions.php:674](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/functions.php#L674-L731) * function[is_serialized_string()](https://developer.wordpress.org/reference/functions/is_serialized_string/) * Checks whether serialized data is of string type. * Used by [1 function](https://developer.wordpress.org/reference/functions/is_serialized_string/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/is_serialized_string/#uses) | Source: [wp-includes/functions.php:741](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/functions.php#L741-L760) * function[is_server_error()](https://developer.wordpress.org/reference/functions/is_server_error/) * Used by [0 functions](https://developer.wordpress.org/reference/functions/is_server_error/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/is_server_error/#uses) | Source: [wp-includes/rss.php:714](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/rss.php#L714-L716) * function[is_single()](https://developer.wordpress.org/reference/functions/is_single/) * Determines whether the query is for an existing single post. * Used by [10 functions](https://developer.wordpress.org/reference/functions/is_single/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/is_single/#uses) | Source: [wp-includes/query.php:729](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/query.php#L729-L738) * function[is_singular()](https://developer.wordpress.org/reference/functions/is_singular/) * Determines whether the query is for an existing single post of any post type ( post, attachment, page, custom post types). * Used by [21 functions](https://developer.wordpress.org/reference/functions/is_singular/#used-by) | Uses [3 functions](https://developer.wordpress.org/reference/functions/is_singular/#uses) | Source: [wp-includes/query.php:762](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/query.php#L762-L771) [Previous Page](https://developer.wordpress.org/reference/functions/page/37/?output_format=md) [1](https://developer.wordpress.org/reference/functions/?output_format=md) … [36](https://developer.wordpress.org/reference/functions/page/36/?output_format=md) 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