Singleton Design in PHP

Question

I am using a singleton design pattern in a PHP application to create a database connection and select a database. I use this instance many times in a CRUD application.

Are there any problems if my application accesses the database on several threads, for example, receiving false results?

Is the created instance per session or for all threads?

Answer 1

There are no threads in PHP. Each request starts from scratch; objects and resources are not used.

Answer 2

Unless you have some kind of weird frankenstein setup, all requests handled by php are independent and report nothing. Therefore, a singleton instance for each request (I think you are calling a thread).

Therefore, you do not need to worry about the user getting something that was intended for user B.

Answer 3

PHP is single threaded. Every time a PHP script is executed, it starts from scratch. Objects created in the script are recreated every time.

Answer 4

There should be no problems with multithreading, because PHP is not multithreaded.