Warning: mysql_connect(): Too many connections in /var/www/core/DB.php on line 28

Fatal error: Uncaught exception 'Exception' with message 'Cannot connect to MySQL server at host "localhost" as "localphp":Too many connections' in /var/www/core/DB.php:29
Stack trace:
#0 /var/www/core/DB.php(29): core\DB::connect()
#1 /var/www/core/DB.php(24): core\DB->connect()
#2 /var/www/core/WebApplication.php(277): core\DB->init()
#3 /var/www/core/WebApplication.php(252): core\WebApplication->createService()
#4 /var/www/core/WebApplication.php(262): core\WebApplication->get()
#5 /var/www/core/WebApplication.php(389): core\WebApplication->__get('DB')
#6 /var/www/core/WebApplication.php(380): core\WebApplication->isModuleEnabled('template_manage...')
#7 /var/www/core/WebApplication.php(238): core\WebApplication->isClassAllowed()
#8 /var/www/core/WebApplication.php(152): core\WebApplication->getImplementationsOf()
#9 /var/www/core/WebApplication.php(175): core\WebApplication->defineServices()
#10 /var/www/index.php(39): core\WebApplication->run()
#11 {main}
  thrown in /var/www/core/DB.php on line 29