ctype_xdigit

(PHP 4 >= 4.0.4)

ctype_xdigit --  Check for character(s) representing a hexadecimal digit

Description

bool ctype_xdigit (string c)

Warning

This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change in a future release of PHP without notice. Be warned and use this function at your own risk.