Possible Duplicate:
How can one use multi threading in php applications
Does PHP have threading?
Threads in PHP
Is it possible to start separated threads that you can run multiple processes at a given time like you can in c# and java and etc in PHP?
If yes, how can it be done?
If no, why not? Perhaps this not a good idea for web environment?
PHP does not supports threads as such but you can create child processes which will act independently in a similar way to threads. See the PHP manual for details: http://uk3.php.net/pcntl_fork
Someone has also written their own thread class which you can use. It uses the pcntl_fork method and wraps it up a bit to make it similar to the java.lang.Thread implementation.