XIV. Character type functions
| Warning |
This module is EXPERIMENTAL. That means, that the behaviour of these functions, these function names, in concreto ANYTHING documented here can change in a future release of PHP WITHOUT NOTICE. Be warned, and use this module at your own risk. |
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.
| Warning |
These functions are new as of PHP 4.0.4 and might change their
name in the near future. Suggestions are to change them to
ctype_issomething() instead of
ctype_something() or even to make them part of
ext/standard and use their original C-names,
although this would possibly lead to further confusion regarding
the isset()
vs. is_sometype() problem.
|
- 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
