term_exists( int|string $term, string $taxonomy = '', int $parent = null )

Determines whether a term exists.

Contents

Description Description

Formerly is_term(), introduced in 2.3.0.

For more information on this and similar theme functions, check out the Conditional Tags article in the Theme Developer Handbook.

Parameters Parameters

$term

(int|string) (Required) The term to check. Accepts term ID, slug, or name.

$taxonomy

(string) (Optional) The taxonomy name to use

Default value: ''

$parent

(int) (Optional) ID of parent term under which to confine the exists search.

Default value: null

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Return Return

(mixed) Returns null if the term does not exist. Returns the term ID if no taxonomy is specified and the term ID exists. Returns an array of the term ID and the term taxonomy ID if the taxonomy is specified and the pairing exists.

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Source Source

File: wp-includes/taxonomy.php 

function term_exists( $term, $taxonomy = '', $parent = null ) {
	global $wpdb;

	$select     = "SELECT term_id FROM $wpdb->terms as t WHERE ";
	$tax_select = "SELECT tt.term_id, tt.term_taxonomy_id FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy as tt ON tt.term_id = t.term_id WHERE ";

	if ( is_int( $term ) ) {
		if ( 0 == $term ) {
			return 0;
		}
		$where = 't.term_id = %d';
		if ( ! empty( $taxonomy ) ) {
			return $wpdb->get_row( $wpdb->prepare( $tax_select . $where . ' AND tt.taxonomy = %s', $term, $taxonomy ), ARRAY_A );
		} else {
			return $wpdb->get_var( $wpdb->prepare( $select . $where, $term ) );
		}
	}

	$term = trim( wp_unslash( $term ) );
	$slug = sanitize_title( $term );

	$where             = 't.slug = %s';
	$else_where        = 't.name = %s';
	$where_fields      = array( $slug );
	$else_where_fields = array( $term );
	$orderby           = 'ORDER BY t.term_id ASC';
	$limit             = 'LIMIT 1';
	if ( ! empty( $taxonomy ) ) {
		if ( is_numeric( $parent ) ) {
			$parent              = (int) $parent;
			$where_fields[]      = $parent;
			$else_where_fields[] = $parent;
			$where              .= ' AND tt.parent = %d';
			$else_where         .= ' AND tt.parent = %d';
		}

		$where_fields[]      = $taxonomy;
		$else_where_fields[] = $taxonomy;

		if ( $result = $wpdb->get_row( $wpdb->prepare( "SELECT tt.term_id, tt.term_taxonomy_id FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy as tt ON tt.term_id = t.term_id WHERE $where AND tt.taxonomy = %s $orderby $limit", $where_fields ), ARRAY_A ) ) {
			return $result;
		}

		return $wpdb->get_row( $wpdb->prepare( "SELECT tt.term_id, tt.term_taxonomy_id FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy as tt ON tt.term_id = t.term_id WHERE $else_where AND tt.taxonomy = %s $orderby $limit", $else_where_fields ), ARRAY_A );
	}

	if ( $result = $wpdb->get_var( $wpdb->prepare( "SELECT term_id FROM $wpdb->terms as t WHERE $where $orderby $limit", $where_fields ) ) ) {
		return $result;
	}

	return $wpdb->get_var( $wpdb->prepare( "SELECT term_id FROM $wpdb->terms as t WHERE $else_where $orderby $limit", $else_where_fields ) );
}

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Changelog Changelog

Changelog
Version Description
3.0.0 Introduced.

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Uses Uses

Uses
Uses Description
wp-includes/formatting.php: wp_unslash()

Remove slashes from a string or array of strings.
wp-includes/formatting.php: sanitize_title()

Sanitizes a title, or returns a fallback title.
wp-includes/wp-db.php: wpdb::get_row()

Retrieve one row from the database.
wp-includes/wp-db.php: wpdb::get_var()

Retrieve one variable from the database.
wp-includes/wp-db.php: wpdb::prepare()

Prepares a SQL query for safe execution. Uses sprintf()-like syntax.

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Used By Used By

Used By
Used By Description
wp-admin/includes/export.php: export_wp()

Generates the WXR export file for download.
wp-admin/includes/taxonomy.php: category_exists()

Check whether a category exists.
wp-admin/includes/taxonomy.php: wp_insert_category()

Updates an existing Category or creates a new Category.
wp-admin/includes/taxonomy.php: tag_exists()

Check whether a post tag with a given name exists.
wp-admin/includes/taxonomy.php: wp_create_term()

Add a new term to the database if it does not already exist.
wp-includes/deprecated.php: is_term()

Check if Term exists.
wp-includes/taxonomy.php: wp_unique_term_slug()

Will make slug unique, if it isn’t already.
wp-includes/taxonomy.php: wp_update_term()

Update term based on arguments provided.
wp-includes/taxonomy.php: wp_insert_term()

Add a new term to the database.
wp-includes/taxonomy.php: wp_set_object_terms()

Create Term and Taxonomy Relationships.
wp-includes/taxonomy.php: wp_remove_object_terms()

Remove term(s) associated with a given object.
wp-includes/taxonomy.php: wp_delete_term()

Removes a term from the database.
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User Contributed Notes User Contributed Notes

  2. Skip to note 2 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 —

    Checks to see if ‘Uncategorized’ category exists
    Check if the ‘Uncategorized’ category exists
    Note: term_exists() runs a database query. get_term() can be used for the same purpose, except it uses the term cache.

    $term = term_exists( 'Uncategorized', 'category' );
if ( $term !== 0 && $term !== null ) {
	echo __( "'Uncategorized' category exists!", "textdomain" );
}
  3. Skip to note 3 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 —

    Checks to see if ‘Untagged’ post_tag category exists
    Note: term_exists() runs a database query. get_term() can be used for the same purpose, except it uses the term cache.

    $term = term_exists( 'Untagged', 'post_tag' );
if ( $term !== 0 && $term !== null ) {
	echo __( "'Untagged' post_tag exists!", "textdomain" );
}

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