![]() In the mean time please accept my apology for being a little over the top in my previous post. If you want to continue your insults, please comment on my posts here: If he is truly testing for unique values in a MySQL table, then IMHO MySQL routines are the fastest, most efficient, and most well built for the job. If he was to flex a little with his requirement for the format, PHP has already solved his problem without any effort on his part. Kemik might benefit from knowing some time in the future that PHP has already created a randomized string for his upload. Having folks explore different options often times explores flaws in designs they realize they've made along the way too. Especially when multiple options are presented. Most of the use cases presented in these forums become less important than what is presented. :roll:īut this nice person (Kemik) might benefit from something other than personal insults. OK.I'll admit the characterization was a close match. Randy's a smartass and I hope I never have to clean up one of his apps, especially if he thinks a substring of a unique string will result in a unique string. You would still have to combine it with the while() loop I explained to ensure a random string is actually being entered into the database.ģ. ![]() Yes, Randy's solution is better because it doesn't include the loading of a library.Ģ. So, the conclusion of today's lesson folks:ġ. and well, I guess you can see where I am going with this. Now, fail whale decides to visit our little web app and he gets the random string: u0sduf003kz832jh93hj0fjewlsnud We substring it down to u0sdu and insert. Let's say it's: u0sduf0duf9832jhewhj0fjew9f7ud Uniqid() - no matter how many times you feel like hashing, seeding, etc. DING DING DING! The database tries to insert 01, the app pukes, and fail whale gives you a sweet little visit. What happens when we insert that into the database and the next guy comes along and receives 018 for his random string. Now, we substring that down to 2 characters and we have 01. Mike_uniqid() will generate a unique string that is 3 characters long, digits only. Let's simplify things a bit, so we're all following along. Uniqid() will generate a random, unique, 13-character string. UUID based on timestamps (V1, V2) and MAC address may lead to collisions at very high generation frequency (in the same. Which, simply wouldn't work - for very apparent reasons. Using UUID V1, V2: only the V4 (random value) version of UUID is acceptable. This is especially useful when you have multiple types of IDs in your system.$this->db->insert('table', array('code' => substr($moreUnique, 5))) This way we can ensure that we always use the same prefix for the same type of ID. We use a simple function that takes a typed prefix and then generates the ID for us. Lastly, I'd like to share our implementation here and how we use it in our codebase. Whether it's copying identifiers with ease, differentiating between different environments, or achieving shorter and more readable identifier strings, these strategies can contribute to a more user-friendly and robust identification system. This will provide a better experience for both users and developers, as they interact with and manage various entities within the system. Lengthīy implementing these improvements, we can enhance the usability and efficiency of unique identifiers in our applications. If our collision rate would go up significantly, we could simply increase the length of all future IDs and we’d be fine. In case an ID exists already, we just generate a new one and try again. In our MySQL database we use IDs mostly as primary key and the database protects us from collisions. Fortunately, this is pretty easy to do in your database layer. Reducing the length of your IDs can be nice, but you need to be careful and ensure your system is protected against ID collissions. By reducing the entropy of the identifiers, we can generate shorter IDs while still maintaining an acceptable level of uniqueness. In some cases, shorter identifiers can be sufficient, depending on the specific requirements of the application. Not all identifiers need to have a high level of collision resistance. ![]() ![]() The more states, the higher your collision resistance is because it takes more generations to generate the same ID twice (on average and if your algorithm is truly random) Changing the entropy ![]() We generated a 22 character long ID here, which can encode nearly twice as many states as a UUID while being 10 characters shorter. Import ` // prefix_KSPKGySWPqJWWWa37RqGaX ![]()
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