What is thread safe or non-thread safe in PHP?

Question

I saw different binaries for PHP, like non-thread or thread safe? What does this mean? What is the difference between these packages?

Answer 1

Thread Safe (TS) and Non-Thread Safe (TS) are the two different PHP builds available. Thread-safety ensures that when the shared data structure is manipulated by different threads, it is free from race conditions. This version is recommended where the web server run multiple threads of execution simultaneously for different requests.