[PHP] Valid Chars....no fun!

[Jay]

Hi!
I got this code from here, i think it was "Ni Shurong" who gave it to 
me. The code works pretty good. Except i found that sending "asdas." 
into the function will return true...it should return false. What i am 
trying to do is check for valid chars. Only alpha and numeric. Can 
someone help me correct the code:

function isValid($strData, $bIncludeAlpha=false, $bIncludeNumber=false)
{
     switch(true) {
         case $bIncludeAlpha && !$bIncludeNumber:
             $ptr = "/^[a-zA-Z]+/";
             break;
         case !$bIncludeAlpha && $bIncludeNumber:
             $ptr = "/^[0-9]+/";
             break;
         case $bIncludeAlpha && $bIncludeNumber:
             $ptr = "/^[a-zA-Z0-9]+/";
             break;
         default:
             return false;
     }
     return preg_match($ptr, $strData);
}
Thanx In Advance
Jay
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