Tagged as Codex

wp_title is WP funtion that displays or returns the title of the page. A separator string can be defined and it can be designated to print before or after the title of the page.
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username_exist is a WP function that returns the user ID if the user exists or null if the user doesn’t exist.
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register_nav_menu() is a WP function that registers a single custom navigation menu in the new custom menu editor of WordPress 3.0. This allows for creation of custom menus in the dashboard for use in your theme.
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wp_count_comments() is a WordPress function that can retrieve a total comment count for the entire website site or for a single article.
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wp_reset_query() is a function that destroys the previous query used on a custom Loop. The function should be called after The Loop to ensure conditional tags work as expected.
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Retrieve an array of objects for each term in post_tag taxonomy.
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Set tags for a post. Every tag that does not already exists will be automatically created. Uses wp_set_post_terms().
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This Conditional Tag checks if the user is visiting using a mobile device. This is a boolean function, meaning it returns either TRUE or FALSE.
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This Conditional Tag checks if any single post is being displayed. This is a boolean function, meaning it returns either TRUE or FALSE.
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This is one of the most used functions in WordPress because it displays a list of WordPress Pages as links, and affords the opportunity to have Home added automatically to the list of Pages displayed. This Tag is useful to customize the Sidebar or Header, but may be used in other Templates as well
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