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Description

Is the query for an existing tag archive page?

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

Usage

$bool = WP_Query::is_tag( $tag );

Parameters

$tag

( int|string|int[]|string[] ) optional – Optional. Tag ID, name, slug, or array of such to check against. Default empty.

Returns

bool Whether the query is for an existing tag archive page.

Source

File name: wordpress/wp-includes/class-wp-query.php
Lines:

  public function is_tag( $tag = '' ) {
    if ( ! $this->WP_Query::is_tag ) {
      return false;
    }

    if ( empty( $tag ) ) {
      return true;
    }

    $tag_obj = $this->WP_Query::get_queried_object();
    if ( ! $tag_obj ) {
      return false;
    }

    $tag = array_map( 'strval', (array) $tag );

    if ( in_array( (string) $tag_obj->term_id, $tag, true ) ) {
      return true;
    } elseif ( in_array( $tag_obj->name, $tag, true ) ) {
      return true;
    } elseif ( in_array( $tag_obj->slug, $tag, true ) ) {
      return true;
    }

    return false;
  }
 

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