![]() however, perhaps you're like me and the thought of using a varchar type for your primary key makes you cringe. The easiest way to get started, would be to just use a varchar field like below CREATE TABLE `user`( $uuidString1 = Ramsey\Uuid\Uuid::uuid4()->toString() $factory->setRandomGenerator($generator) $codec = new Ramsey\Uuid\Codec\TimestampFirstCombCodec($factory->getUuidBuilder()) Installation composer require ramsey/uuid I am going to use a package recommended from an online talk, for generating my UUIDs. PHP Lecture - Identify All the Things With UUIDs!.PHP - Doctrine ORM Good Practices and Tricks.This tutorial will show you how to generate UUIDs in PHP, and learn to store/retrieve them in either MySQL or PostgreSQL. Thus there is no need to change them and worry about maintaining the foreign key relationships. Can copy data across from one database to another without worrying about identifiers clashing.This allows batch inserts of objects without needing to run a SELECT query later to get the IDs. Can assign an object an ID in your application layer and insert it into the database later.However, there are many advantages to swapping over to using a UUID instead. If you are using PostgreSQL you may be using a sequence/serial instead. If you're like me, you've been using integers generated by MySQL auto_increment for the IDs of the rows in your tables. This will never change, unlike the drive letter which may. dev/sda5: UUID="ef2ece1c-dab1-47e7-9e39-79ba1921a302" TYPE="swap" PARTUUID="f7649116-05"Īs you can see, each of the disks is given a UUID which you one use to identify them. * clock_seq_hi_and_reserved to zero and one, respectively.A universally unique identifier (UUID) is a 128 bit number used to identify information in computer systems.Īn example where you might see them is in Linux when you run blkid to identify your disks as shown below: /dev/sda1: UUID="039b9d65-373a-4a64-ba35-696198bc57f1" TYPE="ext4" PARTUUID="f7649116-01" * Set the two most significant bits (bits 6 and 7) of the $time_hi_and_version = $time_hi_and_version | 0x4000 $time_hi_and_version = $time_hi_and_version > 4 $time_hi_and_version = hexdec($time_hi_and_version) * time_hi_and_version field to the 4-bit version number from * Set the four most significant bits (bits 12 through 15) of the $node = bin2hex(substr($randomString, 10, 6)) $clock_seq_hi_and_reserved = bin2hex(substr($randomString, 8, 2)) $time_hi_and_version = bin2hex(substr($randomString, 6, 2)) $time_mid = bin2hex(substr($randomString, 4, 2)) $time_low = bin2hex(substr($randomString, 0, 4)) $randomString = openssl_random_pseudo_bytes(16) My answer is based on comment uniqid user comment but it uses openssl_random_pseudo_bytes function to generate random string instead of reading from /dev/urandom function guid() To generate cryptographically strong random data, instead of using mt_rand(), it's recommended to use either openssl_random_pseudo_bytes() or random_bytes() (php7 onwards).Īn example of how this is implemented with the latter: echo format_uuidv4(random_bytes(16)) įor openssl_random_pseudo_bytes(), take care to ensure the result is cryptographically strong: $data = openssl_random_pseudo_bytes(16, $strong) The below code makes the permutations on the given data and then uses bin2hex() and vsprintf() to do the final formatting. clock_seq_hi_and_reserved (bit 6
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