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- __() – Retrieve the translation of $text.
- __checked_selected_helper() – Private helper function for checked, selected, disabled and readonly.
- __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 installation/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_block_template_info() – Attempts to add custom template information to the template item.
- _add_block_template_part_area_info() – Attempts to add the template part’s area information to the input template.
- _add_default_theme_supports() – Adds default theme supports for block themes when the ‘setup_theme’ action fires.
- _add_plugin_file_editor_to_tools() – Adds the ‘Plugin File Editor’ menu item after the ‘Themes File Editor’ in Tools for block themes.
- _add_post_type_submenus() – Add submenus for post types.
- _add_template_loader_filters() – Adds necessary filters to use ‘wp_template’ posts instead of theme template files.
- _add_themes_utility_last() – Adds the ‘Theme File Editor’ menu item to the bottom of the Appearance (non-block themes) or Tools (block themes) menu.
- _admin_bar_bump_cb() – Prints 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() – Kills WordPress execution and displays Ajax response with an error message.
- _autop_newline_preservation_helper() – Newline preservation help function for wpautop
- _block_template_render_title_tag() – Displays title tag with content, regardless of whether theme has title-tag support.
- _block_template_render_without_post_block_context() – Removes post details from block context when rendering a block template.
- _block_template_viewport_meta_tag() – Renders a ‘viewport’ meta tag.