For Wampp (Windows)
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1. Find out what is your 'PHP Extension Build' version by using phpinfo(). You can use this - http://localhost/?phpinfo=1
2. Download the pthreads that matches your php version (32 bit or 64 bit) and php extension build (currently used VC11). Use this link for download - http://windows.php.net/downloads/pecl/releases/pthreads/
3. Extract the zip -
Move php_pthreads.dll to the 'bin\php\ext\' directory.
Move pthreadVC2.dll to the 'bin\php\' directory.
Move pthreadVC2.dll to the 'bin\apache\bin' directory.
Move pthreadVC2.dll to the 'C:\windows\system32' directory.
4. Open php\php.ini and add
extension=php_pthreads.dll
Now restart server and you are done. Thanks.