Encryption using blowfish

I'm working on encrypting some data using blowfish. The previous
implementation was done using php as follows.

$key = 'some key';
$data = 'data to be encrypted'

$iv = pack('H*', substr($key, 0, 16));

$literak_key =", $key.$key.$key.substr($key,16),";
$cipher = mcrypt_module_open(MCRYPT_BLOWFISH, '', 'cbc', '');
mcrypt_generic_init($cipher, $literalKey, $iv);

When i try to do the same thing using rails, i get a different
encrypted key.

Also, blow fish can take only 56 byte key as its input, so i
manipulated the key as how its done in php and packed it to a hex.

however am not sure how i can pass the iv

blowfish = Crypt::Blowfish.new(key)
encrypted_string = blowfish.encrypt_block(plain_text)

any inputs?

Thanks
Ramya