无数据库的方法在PHP中存储一些数据

I am new to PHP but not programming in general. I want to store some data I retrieve from the web service but I do not think I want a database for that. First, data will be updated quite frequently and its size is always less than 1MB. What is the best, fast but efficient approach in PHP on Apache? Note: I am using a hosting provider so I do not prefer custom installations. Perhaps, singleton? ThanksI am new to PHP but not programming in general.