I think it really depends on your needs and maybe on your ability to use third party libraries: You can see the deprecated tag in this very section.Īs for the drawbacks of this particular method, I don't know but I suppose in exchange for more control (you have to implement your generator), it's a bit more heavy than ramsey/uuid-doctrine. * clock_seq_hi_and_reserved to zero and one, respectively.I don't really know what's really going on with the two methods, but the UUID strategy seems deprecated as for Doctrine 3.0 and should be replaced with a CUSTOM strategy, and thus a custom id generator (which should be extending Doctrine's AbstractIdGenerator). * 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 & 7 of the 9th octet).time_hi_and_version (bits 4-7 of the 7th octet),.To construct a UUIDv4 you can generate 128 bits worth of random data, patch a few fields to make the data comply with the standard, and then format it as hexadecimal groups.Īccording to RFC 4122 - Section 4.4, you need to change these bits: I was hoping someone with more knowledge than me in this area could lend me a hand and help me fix this function so it does adhere to that rule. This is where the functions fails as it doesn't adhere to that. This function generates a valid v4 UUID up until one area. My knowledge in hex, decimal, binary, PHP's bitwise operators and the like is nearly nonexistent. This is the closest I've been able to come. So I've been doing some digging around and I've been trying to piece together a function that generates a valid v4 UUID in PHP.
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