Is there an API function thats me if the php interpreter is thread

I'm working on an IDE and need a way to detect if the server is thread
safe or not to auto-generate the correct php-ini with either
"zend_extension_ts=my-cool-debugger-stuff.so" or "zend_extension=my-
cool-debugger-stuff_ts.so"

I couldn't find something. Is there any other way then parsing the
phpinfo output for "Thread Safety disabled"?