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I do not know the inner workings of php exec() but I like to know if it create processes or threads for execution of external command.

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  • You might take a look at the source code lxr.php.net Commented Dec 9, 2014 at 11:56
  • from the PHP man page it seems like at least on some operating systems it's a process, but of course this is implementation-specific. Can you say which OS you are interested in? Commented Dec 9, 2014 at 11:58
  • Ah, this indicates that it creates a new process Commented Dec 9, 2014 at 11:59

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When you call exec php does not create a thread, it creats a new child process. more information here PHP exec() performance

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It has to be a process. You can't launch a new shell in a thread. Threads are delineations of a single process: you cannot start a new program without creating a new process.

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