I am currently trying to teach myself mcrypt in PHP. I just copied and pasted the following sample code into my php web page:\[code\]$size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CFB);$iv = mcrypt_create_iv($size, MCRYPT_DEV_RANDOM);echo $iv;\[/code\]The following code produced this:\[code\]?