classes/Tasks/BackgroundProcess.php
protected function is_queue_empty() {
		global $wpdb;

		$table  = $wpdb->options;
		$column = 'option_name';

		if ( is_multisite() ) {
			$table  = $wpdb->sitemeta;
			$column = 'meta_key';
		}

		$key = $this->identifier . '_batch_%';

		$count = $wpdb->get_var( $wpdb->prepare( "
			SELECT COUNT(*)
			FROM {$table}
			WHERE {$column} LIKE %s
		", $key ) );

		return ( $count > 0 ) ? false : true;
	}
protected function is_queue_empty() {
		global $wpdb;

		$table  = $wpdb->options;
		$column = 'option_name';

		if ( is_multisite() ) {
			$table  = $wpdb->sitemeta;
			$column = 'meta_key';
		}

		$key = $this->identifier . '_batch_%';

		$count = $wpdb->get_var( $wpdb->prepare( "
			SELECT COUNT(*)
			FROM {$table}
			WHERE {$column} LIKE %s
		", $key ) );

		return ( $count > 0 ) ? false : true;
	}
protected function is_queue_empty ( ) { global $ wpdb ; $ table = $ wpdb -> options ; $ column = 'option_name' ; if ( is_multisite ( ) ) { $ table = $ wpdb -> sitemeta ; $ column = 'meta_key' ; } $ key = $ this -> identifier . '_batch_%' ; $ count = $ wpdb -> get_var ( $ wpdb -> prepare ( "
			SELECT COUNT(*)
			FROM {$table}
			WHERE {$column} LIKE %s
		" , $ key ) ) ; return ( $ count > 0 ) ? false : true ; }
Is queue empty

@return bool
Is queue empty