- Function: is_404()
- Function: is_admin()
- Function: is_admin_bar_showing()
- Function: is_archive()
- Function: is_attachment()
- Function: is_author()
- Function: is_category()
- Function: is_comments_popup()
- Function: is_date()
- Function: is_day()
- Function: is_feed()
- Function: is_front_page()
- Function: is_home()
- Function: is_local_attachment()
- Function: is_main_query
- Function: is_multi_author
- Function: is_month()
- Function: is_new_day()
- Function: is_page()
- Function: is_page_template()
- Function: is_paged()
- Function: is_plugin_active()
- Function: is_plugin_active_for_network()
- Function: is_plugin_inactive()
- Function: is_plugin_page()
- Function: is_post_type_archive()
- Function: is_preview()
- Function: is_search()
- Function: is_single()
- Function: is_singular()
- Function: is_sticky()
- Function: is_tag()
- Function: is_tax()
- Function: is_taxonomy_hierarchical()
- Function: is_time()
- Function: is_trackback()
- Function: is_year()
- Function: in_category()
- Function: in_the_loop()
- Function: is_active_sidebar()
- Function: is_active_widget()
- Function: is_blog_installed()
- Function: is_rtl()
- Function: is_dynamic_sidebar()
- Function: is_user_logged_in()
- Function: has_excerpt()
- Function: has_post_thumbnail()
- Function: has_tag()
- Function: pings_open()
- Function: email exists() : kiểm tra email có tồn tại không
- Function: post_type_exists()
- Function: taxonomy_exists()
- Function: term_exists()
- Function: username exists()
- Function: wp_attachment_is_image()
- Function: wp_script_is()
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