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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
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
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 |