`flock` LOCK_SH, LOCK_EX, LOCK_UN options are exclusive

[mvorisek]

Description

related phpstan issue: phpstan/phpstan#12850

repro: https://3v4l.org/4eurQ

I would expect php to throw an exception when any of LOCK_SH, LOCK_EX, LOCK_UN option is combined in one call.

[TimWolla]

Related: https://externals.io/message/126706