XVI. Character type functions
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This extension is EXPERIMENTAL. The behaviour of this extension, including the
names of its functions, and anything else documented about this extension may change in a future
release of PHP without notice. Be warned and use this extension at your own risk.
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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.
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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.
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- 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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