(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. |