Predefined Constants
ctype_alnum
Ctype
PHP Manual
Ctype Functions
Table of Contents
ctype_alnum
— Check for alphanumeric character(s)
ctype_alpha
— Check for alphabetic character(s)
ctype_cntrl
— Check for control character(s)
ctype_digit
— Check for numeric character(s)
ctype_graph
— Check for any printable character(s) except space
ctype_lower
— Check for lowercase character(s)
ctype_print
— Check for printable character(s)
ctype_punct
— Check for any printable character which is not whitespace or an alphanumeric character
ctype_space
— Check for whitespace character(s)
ctype_upper
— Check for uppercase character(s)
ctype_xdigit
— Check for character(s) representing a hexadecimal digit
Predefined Constants
ctype_alnum
Ctype
PHP Manual