Can someone provide me some information about encryption and decryption of critical 
data such as credit number card in order to stock them on a mysql database in a secure 

What I want to do is making a web interface secured via SSL in order to be able to 
consult some people information. As I don't want the critical information to be 
plaintext on the db, I'm searching for a way to get it encrypted and then decrypted 
when I'm consulting via the interface.

 I've read the php.net documentation and many articles about data 
encryption/decryption but both of them stand theorical about the various algorithms.

Do you know the more secures of them and the way to use them ? 
Do you know people working in the same way or do they prefer another kind of more 
secure solution ?

Thank you for your advice,

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