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XVI. Character type functions

These functions check whether a character or string falls into a certain character class according to the current locale.

When called with an integer argument these functions behave exactly like their C counterparts.

When called with a string argument they will check every character in the string and will only return TRUE if every character in the string matches the requested criteria.

Passing anything else but a string or integer will return FALSE immediately.

Table of Contents
ctype_alnum -- Check for alphanumeric character(s)
ctype_alpha -- Check for alphabetic character(s)
ctype_cntrl -- Check for control character(s)
ctype_digit -- Check for numeric character(s)
ctype_lower -- Check for lowercase character(s)
ctype_graph -- Check for any printable character(s) except space
ctype_print -- Check for printable character(s)
ctype_punct -- Check for any printable character which is not whitespace or an alphanumeric character
ctype_space -- Check for whitespace character(s)
ctype_upper -- Check for uppercase character(s)
ctype_xdigit -- Check for character(s) representing a hexadecimal digit

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