WP_Error

18#[AllowDynamicProperties]19class WP_Error {20	/**21	 * Stores the list of errors.22	 *23	 * @since 2.1.024	 * @var array<int|string, string[]>25	 */26	public $errors = array();27 28	/**29	 * Stores the most recently added data for each error code.30	 *31	 * @since 2.1.032	 * @var array<int|string, mixed>33	 */34	public $error_data = array();35 36	/**37	 * Stores previously added data added for error codes, oldest-to-newest by code.38	 *39	 * @since 5.6.040	 * @var array<int|string, mixed[]>41	 */42	protected $additional_data = array();43 44	/**45	 * Initializes the error.46	 *47	 * If `$code` is empty, the other parameters will be ignored.48	 * When `$code` is not empty, `$message` will be used even if49	 * it is empty. The `$data` parameter will be used only if it50	 * is not empty.51	 *52	 * Though the class is constructed with a single error code and53	 * message, multiple codes can be added using the `add()` method.54	 *55	 * @since 2.1.056	 *57	 * @param string|int $code    Error code.58	 * @param string     $message Error message.59	 * @param mixed      $data    Optional. Error data. Default empty string.60	 */61	public function __construct( $code = '', $message = '', $data = '' ) {62		if ( empty( $code ) ) {63			return;64		}65 66		$this->add( $code, $message, $data );67	}68 69	/**70	 * Retrieves all error codes.71	 *72	 * @since 2.1.073	 *74	 * @return list<int|string> List of error codes, if available.75	 */76	public function get_error_codes() {77		if ( ! $this->has_errors() ) {78			return array();79		}80 81		return array_keys( $this->errors );82	}83 84	/**85	 * Retrieves the first error code available.86	 *87	 * @since 2.1.088	 *89	 * @return string|int Empty string, if no error codes.90	 */91	public function get_error_code() {92		$codes = $this->get_error_codes();93 94		if ( empty( $codes ) ) {95			return '';96		}97