Implementation of Threading in PHP

Can anybody please describe about how to implement threading in PHP programming? What I know for sure is that PHP does not support thread concept. However, please correct me if I'm wrong. If possible, please try to provide some details with one example about PHP threading. If possible, can anybody please also provide some details on thread-safety of PHP modules? I know this is somewhat hot topic in the market, but without any nice & understandable details for dummies like me. Any help is greatly appreciated.
 
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