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.
| Function | Description | PHP |
|---|---|---|
| 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 |
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