Unique ID for user directory ?

[eluser]WanWizard[/eluser]
PECL is handy, but requires control over the PHP installation (which you might not have in all cases) so you can install it.

Alternatively, you can use this PHP function:

Code:

function gen_uuid() {
    return sprintf( 'xx-x-x-x-xxx',
        // 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 )
    );
}

( based on http://www.php.net/manual/en/function.uniqid.php#94959 )