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.