public function register_conditions() {
		$conditions = array_merge( $this->generate_post_type_conditions(), $this->generate_taxonomy_conditions() );

		$conditions['is_front_page'] = array(
			'group'    => __( 'General', 'popup-maker' ),
			'name'     => __( 'Home Page', 'popup-maker' ),
			'callback' => 'is_front_page',
			'priority' => 2,
		);

		$conditions['is_home'] = array(
			'group'    => __( 'Posts', 'popup-maker' ),
			'name'     => __( 'Blog Index', 'popup-maker' ),
			'callback' => 'is_home',
			'priority' => 1,
		);

		$conditions['is_search'] = array(
			'group'    => __( 'General', 'popup-maker' ),
			'name'     => __( 'Search Result Page', 'popup-maker' ),
			'callback' => 'is_search',
		);

		$conditions['is_404'] = array(
			'group'    => __( 'General', 'popup-maker' ),
			'name'     => __( '404 Error Page', 'popup-maker' ),
			'callback' => 'is_404',
		);

		$conditions = apply_filters( 'pum_registered_conditions', $conditions );

		// @deprecated filter.
		$old_conditions = apply_filters( 'pum_get_conditions', array() );

		foreach ( $old_conditions as $id => $condition ) {
			if ( ! empty( $condition['labels'] ) && ! empty( $condition['labels']['name'] ) ) {
				$condition['name'] = $condition['labels']['name'];
				unset( $condition['labels'] );
			}
			if ( ! isset( $conditions[ $id ] ) ) {
				$conditions[ $id ] = $condition;
			}
		}

		$this->add_conditions( $conditions );
	}