PHP - Character Functions
The functions provided by this extension 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 from ctype.h
Beginning with PHP 4.2.0 these functions are enabled by default. For older versions you have to configure and compile PHP with --enable-ctype. You can disable ctype support with --disable-ctype.
Builtin support for ctype is available with PHP 4.3.0.
This extension has no configuration directives defined in php.ini.
List of Functions
PHP − indicates the earliest version of PHP that supports the function.
|ctype_alnum()||Check for alphanumeric character(s)||4.0.4|
|ctype_alpha()||Check for alphabetic character(s)||4.0.4|
|ctype_cntrl()||Check for control character(s)||4.0.4|
|ctype_digit()||Check for numeric character(s)||4.0.4|
|ctype_graph()||Check for any printable character(s) except space||4.0.4|
|ctype_lower()||Check for lowercase character(s)||4.0.4|
|ctype_print()||Check for printable character(s)||4.0.4|
|ctype_punct()||Check for any printable character which is not whitespace or an alphanumeric character||4.0.4|
|ctype_space()||Check for whitespace character(s)||4.0.4|
|ctype_upper()||Check for uppercase character(s)||4.0.4|
|ctype_xdigit()||Check for character(s) representing a hexadecimal digit||4.0.4|