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/**
 * Taxonomy API: WP_Term class
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 4.4.0
 */

/**
 * Core class used to implement the WP_Term object.
 *
 * @since 4.4.0
 *
 * @property-read object $data Sanitized term data.
 */
#[AllowDynamicProperties]
final class WP_Term {

	/**
	 * Term ID.
	 *
	 * @since 4.4.0
	 * @var int
	 */
	public $term_id;

	/**
	 * The term&#039;s name.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	public $name = &#039;&#039;;

	/**
	 * The term&#039;s slug.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	public $slug = &#039;&#039;;

	/**
	 * The term&#039;s term_group.
	 *
	 * @since 4.4.0
	 * @var int
	 */
	public $term_group = &#039;&#039;;

	/**
	 * Term Taxonomy ID.
	 *
	 * @since 4.4.0
	 * @var int
	 */
	public $term_taxonomy_id = 0;

	/**
	 * The term&#039;s taxonomy name.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	public $taxonomy = &#039;&#039;;

	/**
	 * The term&#039;s description.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	public $description = &#039;&#039;;

	/**
	 * ID of a term&#039;s parent term.
	 *
	 * @since 4.4.0
	 * @var int
	 */
	public $parent = 0;

	/**
	 * Cached object count for this term.
	 *
	 * @since 4.4.0
	 * @var int
	 */
	public $count = 0;

	/**
	 * Stores the term object&#039;s sanitization level.
	 *
	 * Does not correspond to a database field.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	public $filter = &#039;raw&#039;;

	/**
	 * Retrieve WP_Term instance.
	 *
	 * @since 4.4.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param int    $term_id  Term ID.
	 * @param string $taxonomy Optional. Limit matched terms to those matching `$taxonomy`. Only used for
	 *                         disambiguating potentially shared terms.
	 * @return WP_Term|WP_Error|false Term object, if found. WP_Error if `$term_id` is shared between taxonomies and
	 *                                there&#039;s insufficient data to distinguish which term is intended.
	 *                                False for other failures.
	 */
	public static function get_instance( $term_id, $taxonomy = null ) {
		global $wpdb;

		$term_id = (int) $term_id;
		if ( ! $term_id ) {
			return false;
		}

		$_term = wp_cache_get( $term_id, &#039;terms&#039; );

		// If there isn&#039;t a cached version, hit the database.
		if ( ! $_term || ( $taxonomy &amp;&amp; $taxonomy !== $_term-&gt;taxonomy ) ) {
			// Any term found in the cache is not a match, so don&#039;t use it.
			$_term = false;

			// Grab all matching terms, in case any are shared between taxonomies.
			$terms = $wpdb-&gt;get_results( $wpdb-&gt;prepare( &quot;SELECT t.*, tt.* FROM $wpdb-&gt;terms AS t INNER JOIN $wpdb-&gt;term_taxonomy AS tt ON t.term_id = tt.term_id WHERE t.term_id = %d&quot;, $term_id ) );
			if ( ! $terms ) {
				return false;
			}

			// If a taxonomy was specified, find a match.
			if ( $taxonomy ) {
				foreach ( $terms as $match ) {
					if ( $taxonomy === $match-&gt;taxonomy ) {
						$_term = $match;
						break;
					}
				}

				// If only one match was found, it&#039;s the one we want.
			} elseif ( 1 === count( $terms ) ) {
				$_term = reset( $terms );

				// Otherwise, the term must be shared between taxonomies.
			} else {
				// If the term is shared only with invalid taxonomies, return the one valid term.
				foreach ( $terms as $t ) {
					if ( ! taxonomy_exists( $t-&gt;taxonomy ) ) {
						continue;
					}

					// Only hit if we&#039;ve already identified a term in a valid taxonomy.
					if ( $_term ) {
						return new WP_Error( &#039;ambiguous_term_id&#039;, __( &#039;Term ID is shared between multiple taxonomies&#039; ), $term_id );
					}

					$_term = $t;
				}
			}

			if ( ! $_term ) {
				return false;
			}

			// Don&#039;t return terms from invalid taxonomies.
			if ( ! taxonomy_exists( $_term-&gt;taxonomy ) ) {
				return new WP_Error( &#039;invalid_taxonomy&#039;, __( &#039;Invalid taxonomy.&#039; ) );
			}

			$_term = sanitize_term( $_term, $_term-&gt;taxonomy, &#039;raw&#039; );

			// Don&#039;t cache terms that are shared between taxonomies.
			if ( 1 === count( $terms ) ) {
				wp_cache_add( $term_id, $_term, &#039;terms&#039; );
			}
		}

		$term_obj = new WP_Term( $_term );
		$term_obj-&gt;filter( $term_obj-&gt;filter );

		return $term_obj;
	}

	/**
	 * Constructor.
	 *
	 * @since 4.4.0
	 *
	 * @param WP_Term|object $term Term object.
	 */
	public function __construct( $term ) {
		foreach ( get_object_vars( $term ) as $key =&gt; $value ) {
			$this-&gt;$key = $value;
		}
	}

	/**
	 * Sanitizes term fields, according to the filter type provided.
	 *
	 * @since 4.4.0
	 *
	 * @param string $filter Filter context. Accepts &#039;edit&#039;, &#039;db&#039;, &#039;display&#039;, &#039;attribute&#039;, &#039;js&#039;, &#039;rss&#039;, or &#039;raw&#039;.
	 */
	public function filter( $filter ) {
		sanitize_term( $this, $this-&gt;taxonomy, $filter );
	}

	/**
	 * Converts an object to array.
	 *
	 * @since 4.4.0
	 *
	 * @return array Object as array.
	 */
	public function to_array() {
		return get_object_vars( $this );
	}

	/**
	 * Getter.
	 *
	 * @since 4.4.0
	 *
	 * @param string $key Property to get.
	 * @return mixed Property value.
	 */
	public function __get( $key ) {
		switch ( $key ) {
			case &#039;data&#039;:
				$data    = new stdClass();
				$columns = array( &#039;term_id&#039;, &#039;name&#039;, &#039;slug&#039;, &#039;term_group&#039;, &#039;term_taxonomy_id&#039;, &#039;taxonomy&#039;, &#039;description&#039;, &#039;parent&#039;, &#039;count&#039; );
				foreach ( $columns as $column ) {
					$data-&gt;{$column} = isset( $this-&gt;{$column} ) ? $this-&gt;{$column} : null;
				}

				return sanitize_term( $data, $data-&gt;taxonomy, &#039;raw&#039; );
		}
	}
}
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