PHP - Php Scheduling

Hello to everyone

Does anyone knows how to schedule php script? I have a script that saves the scheduled task on MYSQL database. What i want is that when the scheduled task reach its due date, the php script will initiate automatically without any user interaction.

I've tried using Windows Scheduler but it will not solve my problem because windows scheduler only runs when it reaches its scheduled time. Only then the script will initiate.

Please help me guys. I will really appreciate all the help i cant get.

thanks in advance