Title: Functions | Page 47 of 49 | Developer.WordPress.org --- # Functions * function[previous_image_link()](https://developer.wordpress.org/reference/functions/previous_image_link/) * Displays previous image link that has the same post parent. * Used by [0 functions](https://developer.wordpress.org/reference/functions/previous_image_link/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/previous_image_link/#uses) | Source: [wp-includes/media.php:3892](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/media.php#L3892-L3894) * function[previous_post()](https://developer.wordpress.org/reference/functions/previous_post/) * Prints a link to the previous post. * Used by [0 functions](https://developer.wordpress.org/reference/functions/previous_post/#used-by) | Uses [4 functions](https://developer.wordpress.org/reference/functions/previous_post/#uses) | Source: [wp-includes/deprecated.php:137](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/deprecated.php#L137-L158) * function[previous_posts()](https://developer.wordpress.org/reference/functions/previous_posts/) * Displays or retrieves the previous posts page link. * Used by [1 function](https://developer.wordpress.org/reference/functions/previous_posts/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/previous_posts/#uses) | Source: [wp-includes/link-template.php:2650](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/link-template.php#L2650-L2659) * function[previous_posts_link()](https://developer.wordpress.org/reference/functions/previous_posts_link/) * Displays the previous posts page link. * Used by [0 functions](https://developer.wordpress.org/reference/functions/previous_posts_link/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/previous_posts_link/#uses) | Source: [wp-includes/link-template.php:2704](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/link-template.php#L2704-L2706) * function[previous_post_link()](https://developer.wordpress.org/reference/functions/previous_post_link/) * Displays the previous post link that is adjacent to the current post. * Used by [0 functions](https://developer.wordpress.org/reference/functions/previous_post_link/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/previous_post_link/#uses) | Source: [wp-includes/link-template.php:2285](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/link-template.php#L2285-L2287) * function[prev_post_rel_link()](https://developer.wordpress.org/reference/functions/prev_post_rel_link/) * Displays the relational link for the previous post adjacent to the current post. * Used by [0 functions](https://developer.wordpress.org/reference/functions/prev_post_rel_link/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/prev_post_rel_link/#uses) | Source: [wp-includes/link-template.php:2180](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/link-template.php#L2180-L2182) * function[pre_schema_upgrade()](https://developer.wordpress.org/reference/functions/pre_schema_upgrade/) * Runs before the schema is upgraded. * Used by [1 function](https://developer.wordpress.org/reference/functions/pre_schema_upgrade/#used-by) | Uses [6 functions](https://developer.wordpress.org/reference/functions/pre_schema_upgrade/#uses) | Source: [wp-admin/includes/upgrade.php:3730](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/upgrade.php#L3730-L3796) * function[print_admin_styles()](https://developer.wordpress.org/reference/functions/print_admin_styles/) * Prints the styles queue in the HTML head on admin pages. * Used by [2 functions](https://developer.wordpress.org/reference/functions/print_admin_styles/#used-by) | Uses [4 functions](https://developer.wordpress.org/reference/functions/print_admin_styles/#uses) | Source: [wp-includes/script-loader.php:2341](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/script-loader.php#L2341-L2363) * function[print_column_headers()](https://developer.wordpress.org/reference/functions/print_column_headers/) * Prints column headers for a particular screen. * Used by [0 functions](https://developer.wordpress.org/reference/functions/print_column_headers/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/print_column_headers/#uses) | Source: [wp-admin/includes/list-table.php:104](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/list-table.php#L104-L108) * function[print_embed_comments_button()](https://developer.wordpress.org/reference/functions/print_embed_comments_button/) * Prints the necessary markup for the embed comments button. * Used by [0 functions](https://developer.wordpress.org/reference/functions/print_embed_comments_button/#used-by) | Uses [6 functions](https://developer.wordpress.org/reference/functions/print_embed_comments_button/#uses) | Source: [wp-includes/embed.php:1134](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/embed.php#L1134-L1156) * function[print_embed_scripts()](https://developer.wordpress.org/reference/functions/print_embed_scripts/) * Prints the JavaScript in the embed iframe header. * Used by [0 functions](https://developer.wordpress.org/reference/functions/print_embed_scripts/#used-by) | Uses [4 functions](https://developer.wordpress.org/reference/functions/print_embed_scripts/#uses) | Source: [wp-includes/embed.php:1103](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/embed.php#L1103-L1108) * function[print_embed_sharing_button()](https://developer.wordpress.org/reference/functions/print_embed_sharing_button/) * Prints the necessary markup for the embed sharing button. * Used by [0 functions](https://developer.wordpress.org/reference/functions/print_embed_sharing_button/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/print_embed_sharing_button/#uses) | Source: [wp-includes/embed.php:1163](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/embed.php#L1163-L1174) * function[print_embed_sharing_dialog()](https://developer.wordpress.org/reference/functions/print_embed_sharing_dialog/) * Prints the necessary markup for the embed sharing dialog. * Used by [0 functions](https://developer.wordpress.org/reference/functions/print_embed_sharing_dialog/#used-by) | Uses [9 functions](https://developer.wordpress.org/reference/functions/print_embed_sharing_dialog/#uses) | Source: [wp-includes/embed.php:1181](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/embed.php#L1181-L1225) * function[print_embed_styles()](https://developer.wordpress.org/reference/functions/print_embed_styles/) * Prints the CSS in the embed iframe header. * Used by [0 functions](https://developer.wordpress.org/reference/functions/print_embed_styles/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/print_embed_styles/#uses) | Source: [wp-includes/deprecated.php:5896](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/deprecated.php#L5896-L5905) * function[print_emoji_detection_script()](https://developer.wordpress.org/reference/functions/print_emoji_detection_script/) * Prints the inline Emoji detection script if it is not already printed. * Used by [0 functions](https://developer.wordpress.org/reference/functions/print_emoji_detection_script/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/print_emoji_detection_script/#uses) | Source: [wp-includes/formatting.php:5901](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/formatting.php#L5901-L5915) * function[print_emoji_styles()](https://developer.wordpress.org/reference/functions/print_emoji_styles/) * Prints the important emoji-related styles. * Used by [0 functions](https://developer.wordpress.org/reference/functions/print_emoji_styles/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/print_emoji_styles/#uses) | Source: [wp-includes/deprecated.php:5913](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/deprecated.php#L5913-L5939) * function[print_footer_scripts()](https://developer.wordpress.org/reference/functions/print_footer_scripts/) * Prints the scripts that were queued for the footer or too late for the HTML head. * Used by [4 functions](https://developer.wordpress.org/reference/functions/print_footer_scripts/#used-by) | Uses [4 functions](https://developer.wordpress.org/reference/functions/print_footer_scripts/#uses) | Source: [wp-includes/script-loader.php:2186](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/script-loader.php#L2186-L2209) * function[print_head_scripts()](https://developer.wordpress.org/reference/functions/print_head_scripts/) * Prints the script queue in the HTML head on admin pages. * Used by [3 functions](https://developer.wordpress.org/reference/functions/print_head_scripts/#used-by) | Uses [7 functions](https://developer.wordpress.org/reference/functions/print_head_scripts/#uses) | Source: [wp-includes/script-loader.php:2147](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/script-loader.php#L2147-L2174) * function[print_late_styles()](https://developer.wordpress.org/reference/functions/print_late_styles/) * Prints the styles that were queued too late for the HTML head. * Used by [1 function](https://developer.wordpress.org/reference/functions/print_late_styles/#used-by) | Uses [4 functions](https://developer.wordpress.org/reference/functions/print_late_styles/#uses) | Source: [wp-includes/script-loader.php:2375](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/script-loader.php#L2375-L2399) * function[privacy_ping_filter()](https://developer.wordpress.org/reference/functions/privacy_ping_filter/) * Checks whether blog is public before returning sites. * Used by [0 functions](https://developer.wordpress.org/reference/functions/privacy_ping_filter/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/privacy_ping_filter/#uses) | Source: [wp-includes/comment.php:3295](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/comment.php#L3295-L3301) * function[query_posts()](https://developer.wordpress.org/reference/functions/query_posts/) * Sets up The Loop with query parameters. * Used by [0 functions](https://developer.wordpress.org/reference/functions/query_posts/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/query_posts/#uses) | Source: [wp-includes/query.php:97](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/query.php#L97-L100) * function[rawurlencode_deep()](https://developer.wordpress.org/reference/functions/rawurlencode_deep/) * Navigates through an array, object, or scalar, and raw-encodes the values to be used in a URL. * Used by [2 functions](https://developer.wordpress.org/reference/functions/rawurlencode_deep/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/rawurlencode_deep/#uses) | Source: [wp-includes/formatting.php:2887](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/formatting.php#L2887-L2889) * function[read()](https://developer.wordpress.org/reference/functions/avifinfo-read/) * Reads bytes and advances the stream position by the same count. * Used by [0 functions](https://developer.wordpress.org/reference/functions/avifinfo-read/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/avifinfo-read/#uses) | Source: [wp-includes/class-avif-info.php:64](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/class-avif-info.php#L64-L67) * function[readonly()](https://developer.wordpress.org/reference/functions/readonly/) * Outputs the HTML readonly attribute. * Used by [0 functions](https://developer.wordpress.org/reference/functions/readonly/#used-by) | Uses [2 functions](https://developer.wordpress.org/reference/functions/readonly/#uses) | Source: [wp-includes/php-compat/readonly.php:34](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/php-compat/readonly.php#L34-L37) * function[read_big_endian()](https://developer.wordpress.org/reference/functions/avifinfo-read_big_endian/) * Reads an unsigned integer with most significant bits first. * Used by [0 functions](https://developer.wordpress.org/reference/functions/avifinfo-read_big_endian/#used-by) | Uses [0 functions](https://developer.wordpress.org/reference/functions/avifinfo-read_big_endian/#uses) | Source: [wp-includes/class-avif-info.php:42](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/class-avif-info.php#L42-L55) * function[recurse_dirsize()](https://developer.wordpress.org/reference/functions/recurse_dirsize/) * Gets the size of a directory recursively. * Used by [3 functions](https://developer.wordpress.org/reference/functions/recurse_dirsize/#used-by) | Uses [6 functions](https://developer.wordpress.org/reference/functions/recurse_dirsize/#uses) | Source: [wp-includes/functions.php:8815](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/functions.php#L8815-L8914) * function[redirect_canonical()](https://developer.wordpress.org/reference/functions/redirect_canonical/) * Redirects incoming links to the proper URL based on the site url. * Used by [1 function](https://developer.wordpress.org/reference/functions/redirect_canonical/#used-by) | Uses [75 functions](https://developer.wordpress.org/reference/functions/redirect_canonical/#uses) | Source: [wp-includes/canonical.php:42](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/canonical.php#L42-L849) * function[redirect_guess_404_permalink()](https://developer.wordpress.org/reference/functions/redirect_guess_404_permalink/) * Attempts to guess the correct URL for a 404 request based on query vars. * Used by [1 function](https://developer.wordpress.org/reference/functions/redirect_guess_404_permalink/#used-by) | Uses [12 functions](https://developer.wordpress.org/reference/functions/redirect_guess_404_permalink/#uses) | Source: [wp-includes/canonical.php:926](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/canonical.php#L926-L1026) * function[redirect_post()](https://developer.wordpress.org/reference/functions/redirect_post/) * Redirects to previous page. * Used by [0 functions](https://developer.wordpress.org/reference/functions/redirect_post/#used-by) | Uses [6 functions](https://developer.wordpress.org/reference/functions/redirect_post/#uses) | Source: [wp-admin/includes/post.php:2192](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/post.php#L2192-L2234) * function[redirect_this_site()](https://developer.wordpress.org/reference/functions/redirect_this_site/) * Ensures that the current site’s domain is listed in the allowed redirect host list. * Used by [0 functions](https://developer.wordpress.org/reference/functions/redirect_this_site/#used-by) | Uses [1 function](https://developer.wordpress.org/reference/functions/redirect_this_site/#uses) | Source: 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