title: automatically schedule a php script execution at specific time
body: <p>I am developing a web app which requires events. The user creates an event at a specific time, and I need a script to be executed and activate the event at the exact time, so the event can start.
  Any ideas on how I can do this? I googled and searched through stack overflow, but all I encountered was multiple execution at specific time. What I need is execution at automatically set time.
  Hope you help me, I'm desperate.</p>