![]() ![]() The PECL is much slower due to the underlying library ( libuuid) opening a new file descriptor on /dev/urandom each time we call uuid_create() from PHP Code,.The Rasmey implementation is also very fast for the same reason,.PHP uses sys_getrandom() a faster way to get random data. The Polyfill is the fastest because of PHP.It means it is really expensive for the CPU to generate one compared to a V1. The Rasmey implementation is the slowest because the way it deals with counter could be improved.The Polyfill is slower because it must deal with the counter manually,.This overhead comes from the conversion type between PHP and the underlying library, The FFI binding is slower because there is a significant overhead with FFI for things that are really fast in the underlying library.The PECL is the fastest here because it uses some features of the kernel to get incremental data,.But each UUID must be unique, so an internal counter is required. It means there are not so much random data. Section intitulée how-to-explain-these-numbersHow to explain these numbers? Section intitulée for-the-v1For the V1 Section intitulée uuid-v4-random-valuesUUID V4 (random values) +-+-+-+ I created a benchmark to see how theses implementations compare: Section intitulée uuid-v1-time-basedUUID V1 (time based) +-+-+-+ An abstraction layer on top of many generator and an UUID component: ramsey/uuid.So now, there are many ways to generate UUID in PHP, at least 4. Then, we wanted to blog about FFI, a new PHP 7.4 feature, so with Baptiste Leduc we bound the libuuid to PHP. Few weeks ago, with Nicolas Grekas we had the idea to port the PECL extension to plain PHP as a Symfony Polyfill. I prefer the PECL extension over the ramsey/uuid because it’s simpler and more straightforward. * clock_seq_hi_and_reserved to zero and one, respectively.We have been using UUID for years and different ways to generate UUID exist. * 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.
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