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PHP: Random ID illegal character

I have tried it standalone many many times and i got no ID with illegal character. Well, But when the code below working on my website, it is generating illegal characters like: XY�DV3VD, L6XÝOMJ3

The output must consist of [A-Z] and [0-9]. How this could be? Thanks for ideas.

function uniqeeID($len){
 //generate a random id encrypt it and store it in $rnd_id 
 $rnd_id = crypt(uniqid(rand(),1)); 
 //to remove any slashes that might have come 
 $rnd_id = strip_tags(stripslashes($rnd_id)); 
 //Removing any . or / and reversing the string 
 $rnd_id = str_replace(".","",$rnd_id); 
 $rnd_id = strrev(str_replace("/","",$rnd_id)); 
 //finally I take the first $len characters from the $rnd_id 
 $rnd_id = strtoupper(substr($rnd_id,0,$len));
 return $rnd_id;
}

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