Functions
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functioninstall_themes_upload()
Displays a form to upload themes from zip files.
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functioninstall_theme_information()
Displays theme information in dialog box form.
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functioninstall_theme_search_form()
Displays search form for searching themes.
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functionin_category()
Checks if the current post is within any of the given categories.
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functionin_the_loop()
Determines whether the caller is in the Loop.
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functioniso8601_timezone_to_offset()
Given an ISO 8601 timezone, returns its UTC offset in seconds.
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functioniso8601_to_datetime()
Given an ISO 8601 (Ymd\TH:i:sO) date, returns a MySQL DateTime (Y-m-d H:i:s) format used by post_date[_gmt].
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functionis_404()
Determines whether the query has resulted in a 404 (returns no results).
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functionis_admin()
Determines whether the current request is for an administrative interface page.
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functionis_allowed_http_origin()
Determines if the HTTP origin is an authorized one.
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functionis_archive()
Determines whether the query is for an existing archive page.
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functionis_archived()
Checks if a particular blog is archived.
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functionis_attachment()
Determines whether the query is for an existing attachment page.
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functionis_author()
Determines whether the query is for an existing author archive page.
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functionis_avatar_comment_type()
Check if this comment type allows avatars to be retrieved.
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functionis_blog_admin()
Determines whether the current request is for a site’s administrative interface.
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functionis_blog_installed()
Determines whether WordPress is already installed.
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functionis_blog_user()
Checks if the current user belong to a given site.
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functionis_category()
Determines whether the query is for an existing category archive page.
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functionis_child_theme()
Whether a child theme is in use.
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functionis_comments_popup()
Determines whether the current URL is within the comments popup window.
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functionis_comment_feed()
Is the query for a comments feed?
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functionis_customize_preview()
Whether the site is being previewed in the Customizer.
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functionis_date()
Determines whether the query is for an existing date archive.
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functionis_day()
Determines whether the query is for an existing day archive.