With
pthreadsv3pthreadscan only be loaded when using thecliSAPI, thus it is a good practice to keep theextension=pthreads.sodirective inphp-cli.iniONLY, if you are using PHP7 and Pthreads v3.
If you are using Wamp on Windows, you have to configure the extension in php.ini :
Open php\php.ini and add:
extension=php_pthreads.dll
Concerning Linux users, you have to replace .dll by .so:
extension=pthreads.so
You can directly execute this command to add it to php.ini (change /etc/php.ini with your custom path)
echo "extension=pthreads.so" >> /etc/php.ini