https://www.php.net/manual/tr/intlchar.iscntrl.php
PHP: IntlChar::iscntrl - Manual
Check if code point is a control character
phpmanual
https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/iscntrl-iswcntrl-iscntrl-l-iswcntrl-l?view=msvc-170
iscntrl, iswcntrl, _iscntrl_l, _iswcntrl_l | Microsoft Learn
Learn more about: iscntrl, iswcntrl, _iscntrl_l, _iswcntrl_l
iswcntrlmicrosoftlearn
https://en.wikibooks.org/wiki/C%2B%2B_Programming/Code/Standard_C_Library/Functions/iscntrl
C++ Programming/Code/Standard C Library/Functions/iscntrl - Wikibooks, open books for an open world