Instead functions and strategies to hide or divide information, why
not using PHP with PECL extension and GnuPG to manage data using
public/private key.
This way is safer and easier. Only 3 lines of code:
$gpg = new gnupg();
$gpg -> addencryptkey("43243243243243243243243243243243242");
$card_stored = $gpg -> encrypt($Customer_card);
http://pecl.php.net/package/gnupg
http://php.net/manual/en/ref.gnupg.php
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