Question

is_tag( mixed $tag = '' )

Is the query for an existing tag archive page?

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description

If the $tag parameter is specified, this function will additionally check if the query is for one of the tags specified.

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参数

$tag

(mixed) (Optional) Tag ID, name, slug, or array of Tag IDs, names, and slugs.

Default value: ''

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返回值

(bool)

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源代码

File: wp-includes/query.php

function is_tag( $tag = '' ) {
	global $wp_query;

	if ( ! isset( $wp_query ) ) {
		_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' );
		return false;
	}

	return $wp_query->is_tag( $tag );
}

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更新日志

Version	description
2.3.0	Introduced.

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相关函数

Uses

• wp-includes/l10n.php: __()
• wp-includes/class-wp-query.php: WP_Query::is_tag()
• wp-includes/functions.php: _doing_it_wrong()

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Used By

• wp-includes/general-template.php: wp_get_document_title()
• wp-includes/general-template.php: get_the_archive_title()
• wp-includes/category-template.php: term_description()
• wp-includes/category-template.php: wp_list_categories()
• wp-includes/general-template.php: feed_links_extra()
• wp-includes/general-template.php: wp_title()
• wp-includes/general-template.php: single_term_title()
• wp-includes/class-wp.php: WP::handle_404()
• wp-includes/post-template.php: get_body_class()
• wp-includes/canonical.php: redirect_canonical()
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User Contributed Notes

1. Skip to note content You must log in to vote on the helpfulness of this noteVote results for this note: 1You must log in to vote on the helpfulness of this note Contributed by Codex

   Examples

   
   // When any Tag archive page is being displayed.
   is_tag();
   
   // When the archive page for Tag 30 is being displayed.
   is_tag( '30' );
   
   // When the archive page for tag with the Slug of 'extreme' is being displayed.
   is_tag( 'extreme' );
   
   // When the archive page for tag with the Name of 'mild' is being displayed.
   is_tag( 'mild' );
   
   /*
    * Returns true when the tag of posts being displayed is either term_ID 30,
    * or slug "extreme", or name "mild". Note: the array ability was added
    * at Version 3.7.
    */
   is_tag( array( 30, 'mild', 'extreme' ) );