ctype_alnum() error

[TikTokk]

I'm attempting to use ctype_alnum to validate a password. The code:

if(ctype_alnum($formVars['loginPassword']))

when I run the script, I get the following error:
Fatal error: Call to undefined function: ctype_alnum() in /Library/WebServer/Documents/code/validator.php on line 236

My server is running PHP Version 4.1.2
Any ideas why this function is not working?

Thanks

[bad76]

From manual:

Beginning with PHP 4.2.0 these functions are enabled by default. For older versions you have to configure and compile PHP with --enable-ctype. You can disable ctype support with --disable-ctype.

The windows version of PHP has built in support for this extension. You do not need to load any additional extension in order to use these functions.

Note: Builtin support for ctype is available with PHP 4.3.0.

[TikTokk]

Thanks bad76. Now I just have to figure out how to enable it. Or update my PHP. Ugh.