Most used php design patterns at day to day basis?

In order to improve development skills im wondering what are the most often used php patterns on a day to day basis in development and its general purposes

I may start the list with the classics of all the time:

• Sigelton (may consired a semi pattern)
• Factory (an is variants as factory method)
• Mememto (to save status of something at runtime...)

I know the are many more, but they are used with regularity?

Thanks in advice!