Use timer and cron jobs in your application - ExeOutput for PHP Documentation
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how to make dynamic countdown timer in php - YouTube
GitHub - reactphp/event-loop: ReactPHP's core reactor event loop that libraries can use for evented I/O.
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Online Examination System With Timer using PHP MySQL | Free Source Code Download - YouTube
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jQuery Countdown Timer & Digital Clock Plugin - timeTo | Free jQuery Plugins
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Create a Quiz App with Timer using HTML CSS & JavaScript
