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    <p>You are looking for an encryption key?</p> <p><strong>Do not use <code>uniqid()</code> in any context where security is involved. It is too predictable to be used in such context.</strong></p> <p>The <a href="http://pear.php.net/package/Crypt_RSA" rel="noreferrer">PEAR::Crypt_RSA</a> package allows you to generate cryptographically strong keys in PHP. Once installed in your local PEAR install, you may use it to generate a key as follows:</p> <pre><code>require_once 'Crypt/RSA.php'; // Creates a 96-bit key, which is 24 hex chars long $key_pair = new Crypt_RSA_KeyPair(96); //Returns public key from the pair $public_key = $key_pair-&gt;getPublicKey(); //Returns private key from the pair $private_key = $key_pair-&gt;getPrivateKey(); </code></pre> <p>UUID's may also be good for your goal. Here is a class which will generate standard-compliant UUIDs on all systems:</p> <pre><code>&lt;?php /** * UUID generator class * * Generates valid RFC 4211 compliant Universally Unique IDentifiers (UUID) version 3, 4 and 5. * UUIDs generated validate using the OSSP UUID Tool, and the output for named-based UUIDs are * exactly the same. This is a pure PHP implementation. * * Usage: * * Name-based UUID: * * $v3uuid = UUID::v3('1546058f-5a25-4334-85ae-e68f2a44bbaf', 'SomeRandomString'); * $v5uuid = UUID::v5(UUID::NS_URL, 'http://www.google.com/'); * * Pseudo-random UUID: * * $v4uuid = UUID::v4(); * * * Originally found at: http://www.php.net/manual/en/function.uniqid.php#94959 * * @author Andrew Moore * * * Modifications made by Henry Merriam &lt;php@henrymerriam.com&gt; on 2009-12-20: * * + Added constants for predefined namespaces as defined in RFC 4211 Appendix C. * + NS_DNS * + NS_URL * + NS_ISO_UID * + NS_X500_DN * * + Wrote this documentation comment. * */ class UUID { const NS_DNS = '6ba7b810-9dad-11d1-80b4-00c04fd430c8'; // FQDN const NS_URL = '6ba7b811-9dad-11d1-80b4-00c04fd430c8'; // URL const NS_ISO_OID = '6ba7b812-9dad-11d1-80b4-00c04fd430c8'; // ISO OID const NS_X500_DN = '6ba7b814-9dad-11d1-80b4-00c04fd430c8'; // X.500 DN (in DER or a text output format) public static function v3($namespace, $name) { if(!self::is_valid($namespace)) return false; // Get hexadecimal components of namespace $nhex = str_replace(array('-','{','}'), '', $namespace); // Binary Value $nstr = ''; // Convert Namespace UUID to bits for($i = 0; $i &lt; strlen($nhex); $i+=2) { $nstr .= chr(hexdec($nhex[$i].$nhex[$i+1])); } // Calculate hash value $hash = md5($nstr . $name); // Format and return UUID return sprintf('%08s-%04s-%04x-%04x-%12s', // 32 bits for "time_low" substr($hash, 0, 8), // 16 bits for "time_mid" substr($hash, 8, 4), // 16 bits for "time_hi_and_version", // four most significant bits holds version number 3 (hexdec(substr($hash, 12, 4)) &amp; 0x0fff) | 0x3000, // 16 bits, 8 bits for "clk_seq_hi_res", // 8 bits for "clk_seq_low", // two most significant bits holds zero and one for variant DCE1.1 (hexdec(substr($hash, 16, 4)) &amp; 0x3fff) | 0x8000, // 48 bits for "node" substr($hash, 20, 12) ); } public static function v4() { return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x', // 32 bits for "time_low" mt_rand(0, 0xffff), mt_rand(0, 0xffff), // 16 bits for "time_mid" mt_rand(0, 0xffff), // 16 bits for "time_hi_and_version", // four most significant bits holds version number 4 mt_rand(0, 0x0fff) | 0x4000, // 16 bits, 8 bits for "clk_seq_hi_res", // 8 bits for "clk_seq_low", // two most significant bits holds zero and one for variant DCE1.1 mt_rand(0, 0x3fff) | 0x8000, // 48 bits for "node" mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff) ); } public static function v5($namespace, $name) { if(!self::is_valid($namespace)) return false; // Get hexadecimal components of namespace $nhex = str_replace(array('-','{','}'), '', $namespace); // Binary Value $nstr = ''; // Convert Namespace UUID to bits for($i = 0; $i &lt; strlen($nhex); $i+=2) { $nstr .= chr(hexdec($nhex[$i].$nhex[$i+1])); } // Calculate hash value $hash = sha1($nstr . $name); // Format and return UUID return sprintf('%08s-%04s-%04x-%04x-%12s', // 32 bits for "time_low" substr($hash, 0, 8), // 16 bits for "time_mid" substr($hash, 8, 4), // 16 bits for "time_hi_and_version", // four most significant bits holds version number 5 (hexdec(substr($hash, 12, 4)) &amp; 0x0fff) | 0x5000, // 16 bits, 8 bits for "clk_seq_hi_res", // 8 bits for "clk_seq_low", // two most significant bits holds zero and one for variant DCE1.1 (hexdec(substr($hash, 16, 4)) &amp; 0x3fff) | 0x8000, // 48 bits for "node" substr($hash, 20, 12) ); } public static function is_valid($uuid) { return preg_match('/^\{?[0-9a-f]{8}\-?[0-9a-f]{4}\-?[0-9a-f]{4}\-?'. '[0-9a-f]{4}\-?[0-9a-f]{12}\}?$/i', $uuid) === 1; } } </code></pre> <p><strong>Do not use <code>uniqid()</code> in any context where security is involved. It is too predictable to be used in such context.</strong></p>
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    1. POHow to create uniqe key value in PHP?
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    1. USAndrew Moore
    1. USAndrew Moore
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    1. COIf you are going to downvote, leave a comment.
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      1. USAndrew Moore
    2. COI'm not the downvote, but who said anything about a security context?
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      1. USMike Sherov
    3. CO@Mike Sherov: The term **key** is used in the question, versus **id**. **Key** implies that the value will be used for security purposes.
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