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    <ol> <li>The PHP function you are after is Mcrypt (<a href="http://www.php.net/manual/en/intro.mcrypt.php" rel="nofollow noreferrer">http://www.php.net/manual/en/intro.mcrypt.php</a>).</li> </ol> <p>The example from the manual is slightly edited for this example):</p> <pre><code>&lt;?php $iv_size = mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_ECB); $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); $key = "This is a very secret key"; $pass = "PasswordHere"; echo strlen($pass) . "\n"; $crypttext = mcrypt_encrypt(MCRYPT_BLOWFISH, $key, $pass, MCRYPT_MODE_ECB, $iv); echo strlen($crypttext) . "\n"; ?&gt; </code></pre> <p>You would use <a href="http://www.php.net/manual/en/function.mcrypt-decrypt.php" rel="nofollow noreferrer"><strong>mcrypt_decrypt</strong></a> to decrypt your password.</p> <ol start="2"> <li><p>The best <a href="http://www.php.net/manual/en/mcrypt.ciphers.php" rel="nofollow noreferrer">algorithm</a> is rather subjective - ask 5 people, get 5 answers. Personally if the the default (Blowfish) isn't good enough for you, you probably have bigger problems! </p></li> <li><p>Given that it is needed by PHP to encrypt - not sure you can hide it anywhere - welcome comments on this. Standard PHP best coding practices apply of course!</p></li> <li><p>Given that the encryption key will be in your code anyway, not sure what you will gain, providing the rest of your application is secure.</p></li> <li><p>Obviously, if the encrypted password and the encryption key are stolen, then game over. </p></li> </ol> <p>I'd put a rider on my answer - I'm not a PHP crypto expert, but, I think what I have answered is standard practice - I welcome comments other may have. </p>
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    1. POTwo-way encryption: I need to store passwords that can be retrieved
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    1. CO`$pass = $text`. I think he changed that to cater to the question, and didn't notice the second occurrence.
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    2. COTwo things to note. First, `MCRYPT_MODE_ECB` doesn't use an IV. Second, if it did, you'd need to store the IV as you can't decrypt the data without it...
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