https://manpages.ubuntu.com/manpages/xenial/man3/strspn.3.html
Ubuntu Manpage: strspn, strcspn - get length of a prefix substring
get length of a prefix substring
of aubuntumanpagegetlength
https://onlinedocs.microchip.com/oxy/GUID-317042D4-BCCE-4065-BB05-AC4312DBC2C4-en-US-2/GUID-AD73AB92-D599-4AF7-A580-60E7BA2A1B20.html
2.2.19 size_t strcspn
size_t strcspn(const char *__s, const char *__reject) __ATTR_PURE__
size
https://www.php.net/manual/zh/function.strcspn.php
PHP: strcspn - Manual
phpmanual