Unique key generation

Answers of > Unique key generation

One option I have a thought of is creating a w3coded php generating website that will generate the key, storing it w3coded php generating in a database, ensuring it's completely w3coded php generating unique.,The goal of this algorithm is to use the w3coded php generating combination of time and location ("space-time w3coded php generating coordinates" for the relativity geeks out there) w3coded php generating as the uniqueness key. However, timekeeping is w3coded php generating not perfect, so there's a possibility that, for w3coded php generating example, two GUIDs are generated in rapid w3coded php generating succession from the same machine, so close to w3coded php generating each other in time that the timestamp would be w3coded php generating the same. That's where the uniquifier comes w3coded php generating in.,Note about GUIDS: They gain their strength w3coded php generating of uniqueness from their length and the method w3coded php generating used to generate them. Anything less than w3coded php generating 128-bits is not secure. Beyond random number w3coded php generating generation there are characteristics that go w3coded php generating into a GUID to make it more unique. Keep in w3coded php generating mind they are only practically unique, not w3coded php generating completely unique. It is possible, although w3coded php generating practically impossible to have a duplicate. w3coded php generating ,Bottom line: Frankly there is no such thing as w3coded php generating completely unique. Even if you went with a w3coded php generating sequential generator you would eventually run w3coded php generating out of storage using all the atoms in the w3coded php generating universe, thus looping back on yourself and w3coded php generating repeating. Your only hope would be the heat w3coded php generating death of the universe before reaching that w3coded php generating point.

I usually do it like this:

$this->password = '';

for($i=0; $i<10; $i++)
{
    if($i%2 == 0)
        $this->password .= chr(rand(65,90));
    if($i%3 == 0)
        $this->password .= chr(rand(97,122));
    if($i%4 == 0)
        $this->password .= chr(rand(48,57));
}

I recently wanted a quick and simple random unique key so I did the following:

$ukey = dechex(time()) . crypt( time() . md5(microtime() + mt_rand(0, 100000)) ); 

Ingoring the crypting part that does not have much to do with creating a unique value I usually use this one:

function GetUniqueValue()
{
   static $counter = 0; //initalized only 1st time function is called
   return strtr(microtime(), array('.' => '', ' ' => '')) . $counter++;
}

Current topics : Unique key generation

Newly Added Questions