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- __() – Retrieve the translation of $text.
- __autoload() – Autoloader compatibility callback.
- __checked_selected_helper() – Private helper function for checked, selected, and disabled.
- __clear_multi_author_cache() – Helper function to clear the cache for number of authors.
- __construct() – Create a new cache object
- __get_option() – Utility version of get_option that is private to install/upgrade.
- __ngettext_noop() – Register plural strings in POT file, but don’t translate them.
- __ngettext() – Retrieve the plural or single form based on the amount.
- __return_empty_array() – Returns an empty array.
- __return_empty_string() – Returns an empty string.
- __return_false() – Returns false.
- __return_null() – Returns null.
- __return_true() – Returns true.
- __return_zero() – Returns 0.
- _() – WordPress implementation for PHP functions either missing from older PHP versions or not included by default.
- _access_denied_splash() – Displays an access denied message when a user tries to view a site’s dashboard they do not have access to.
- _add_post_type_submenus() – Add submenus for post types.
- _add_themes_utility_last() – Adds the (theme) ‘Editor’ link to the bottom of the Appearance menu.
- _admin_bar_bump_cb() – Default admin bar callback.
- _admin_notice_post_locked() – Outputs the HTML for the notice to say that someone else is editing or has taken over editing of this post.
- _admin_search_query() – Displays the search query.
- _ajax_wp_die_handler() – Kill WordPress ajax execution.
- _autop_newline_preservation_helper() – Newline preservation help function for wpautop
- _c() – Retrieve translated string with vertical bar context
- _canonical_charset() – Retrieve a canonical form of the provided charset appropriate for passing to PHP functions such as htmlspecialchars() and charset html attributes.
- _cleanup_header_comment() – Strip close comment and close php tags from file headers used by WP.
- _cleanup_image_add_caption() – Private preg_replace callback used in image_add_caption()
- _clear_modified_cache_on_transition_comment_status() – Clear the lastcommentmodified cached value when a comment status is changed.
- _close_comments_for_old_post() – Close comments on an old post. Hooked to comments_open and pings_open.
- _close_comments_for_old_posts() – Close comments on old posts on the fly, without any extra DB queries. Hooked to the_posts.
