XVI. Character type functions

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

To get these functions to work, you must have compiled PHP with --enable-ctype.

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