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Limitations

PHP-FPM​

PHP Threads is not supported in a PHP-FPM environment (nginx or apache).

Forking and Data Sharing between Threads​

The only way to share data between threads is by using a shared memory segment. PHP Threads uses the tmpfs filesystem to create a shared memory segment. This filesystem is a memory-based filesystem, so it is very fast.

There are some caveats when using shared memory:

  • Not all systems supports tmpfs. If your system does not support tmpfs, the thread returns will not work.
  • Avoid using large data in the tmpfs. It can slow down your system since you have to serialize and unserializa the data you are sharing.
  • If you are using thread in threads or Promises, there will be some files left in the tmpfs filesystem. You can remove them by calling the Thread::gc() or Promise::gc() method by the end of the execution.

Promises won't work with PHP ZTS​

So far, the Promises won't work with PHP ZTS.