protected function sanitize_raw_event( $raw ) {

		$clean = array();

		foreach ( $raw as $key => $val ) {

			// This will recursively handle any metadata submitted.
			if ( is_array( $val ) ) {
				$val = $this->sanitize_raw_event( $val );
			} elseif ( in_array( $key, array( 'actor_id', 'object_id' ), true ) ) {
				// cast id fields to int.
				$val = absint( $val );
			} else {
				// everything else is a text field.
				$val = sanitize_text_field( $val );
			}

			// Sanitize the key. This will ensure no dirty keys are submitted in metadata.
			$key = is_numeric( $key ) ? $key : sanitize_text_field( $key );

			$clean[ $key ] = $val;

		}

		return $clean;

	}