BP_XProfile_Field_Type::is_valid( string|array $values )

	public function is_valid( $values ) {
		$validated = false;

		// Some types of field (e.g. multi-selectbox) may have multiple values to check.
		foreach ( (array) $values as $value ) {

			// Validate the $value against the type's accepted format(s).
			foreach ( $this->validation_regex as $format ) {
				if ( 1 === preg_match( $format, $value ) ) {
					$validated = true;
					continue;

				} else {
					$validated = false;
				}
			}
		}

		// Handle field types with accepts_null_value set if $values is an empty array.
		if ( ( false === $validated ) && is_array( $values ) && empty( $values ) && $this->accepts_null_value ) {
			$validated = true;
		}

		// If there's a whitelist set, make sure that each value is a whitelisted value.
		if ( ( true === $validated ) && ! empty( $values ) && ! empty( $this->validation_whitelist ) ) {
			foreach ( (array) $values as $value ) {
				if ( ! in_array( $value, $this->validation_whitelist, true ) ) {
					$validated = false;
					break;
				}
			}
		}

		/**
		 * Filters whether or not field type is a valid format.
		 *
		 * @since BuddyPress 2.0.0
		 *
		 * @param bool                   $validated Whether or not the field type is valid.
		 * @param string|array           $values    Value to check against the registered formats.
		 * @param BP_XProfile_Field_Type $this      Current instance of the BP_XProfile_Field_Type class.
		 */
		return (bool) apply_filters( 'bp_xprofile_field_type_is_valid', $validated, $values, $this );
	}