Question

In multi-threaded environments (like most web platforms) I often include some sort of thread ID to the logs of my apps. This enables me to tell exactly what log entry came from which request/thread, when there are multiple requests at once which are simultaneously writing to the same log.

In .NET/C#, this can be done by the formatters of log4net, which by default include the current thread’s ManagedThreadId (a number) or Name (a given name). These properties uniquely identify a thread (see for example: How to log correct context with Threadpool threads using log4net?

In PHP, I have not found anything similar (I asked Google, PHP docs and SO). Does it exist?

Answer 1

zend_thread_id():

int zend_thread_id ( void ) 

This function returns a unique identifier for the current thread.

Although:

This function is only available if PHP has been built with ZTS (Zend Thread Safety) support and debug mode (–enable-debug).

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You could also try yo call mysql_thread_id(), when you use that API for your database access (or mysqli::$thread_id when using mysqli).