PHP - Character Type Checking Functions

Quiz

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

Installation

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.

Runtime Configuration

This extension has no configuration directives defined in php.ini.

List of Functions

Following are the list of functions provided by the Map class −

PHP − indicates the earliest version of PHP that supports the function.

Sr.No	Function & Description	PHP
1	ctype_alnum() Check for alphanumeric character(s)	4.0.4
2	ctype_alpha() Check for alphabetic character(s)	4.0.4
3	ctype_cntrl() Check for control character(s)	4.0.4
4	ctype_digit() Check for numeric character(s)	4.0.4
5	ctype_graph() Check for any printable character(s) except space	4.0.4
6	ctype_lower() Check for lowercase character(s)	4.0.4
7	ctype_print() Check for printable character(s)	4.0.4
8	ctype_punct() Check for any printable character which is not whitespace or an alphanumeric character	4.0.4
9	ctype_space() Check for whitespace character(s)	4.0.4
10	ctype_upper() Check for uppercase character(s)	4.0.4
11	ctype_xdigit() Check for character(s) representing a hexadecimal digit	4.0.4

php_function_reference.htm

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