ctype_alnum | PHP 4.0.4
bool ctype_alnum(mixed c) |
Checks for alphanumeric character(s).

ctype_alpha | PHP 4.0.4
bool ctype_alpha(mixed c) |
Checks for alphabetic character(s).

ctype_cntrl | PHP 4.0.4
bool ctype_cntrl(mixed c) |
Checks for control character(s).

ctype_digit | PHP 4.0.4
bool ctype_digit(mixed c) |
Checks for numeric character(s).

ctype_graph | PHP 4.0.4
bool ctype_graph(mixed c) |
Checks for any printable character(s) except space.

ctype_lower | PHP 4.0.4
bool ctype_lower(mixed c) |
Checks for lowercase character(s).

ctype_print | PHP 4.0.4
bool ctype_print(mixed c) |
Checks for printable character(s).

ctype_punct | PHP 4.0.4
bool ctype_punct(mixed c) |
Checks for any printable character that is not whitespace or an alphanumeric character.

ctype_space | PHP 4.0.4
bool ctype_space(mixed c) |
Checks for whitespace character(s).

ctype_upper | PHP 4.0.4
bool ctype_upper(mixed c) |
Checks for uppercase character(s).

ctype_xdigit | PHP 4.0.4
bool ctype_xdigit(mixed c) |
Checks for character(s) representing a hexadecimal digit.