PHP函数生成v4 UUID

所以我一直在做一些挖掘,我一直在拼凑一个函数,在PHP中生成有效的v4 UUID。 这是我能来的最接近的。 我hex,十进制,二进制,PHP的按位运算符等知识几乎不存在。 此function可以生成有效的v4 UUID,直到一个区域。 第4版UUID应该采取以下forms:

xxxxxxxx-xxxx- 4 xxx- y xxx-xxxxxxxxxxxx

其中y是8,9,A或B.这是函数失败的地方,因为它不符合这个。

我希望在这方面比我有更多知识的人可以借我一把,帮助我解决这个问题,所以它坚持这个规则。

function如下:

<?php function gen_uuid() { $uuid = array( 'time_low' => 0, 'time_mid' => 0, 'time_hi' => 0, 'clock_seq_hi' => 0, 'clock_seq_low' => 0, 'node' => array() ); $uuid['time_low'] = mt_rand(0, 0xffff) + (mt_rand(0, 0xffff) << 16); $uuid['time_mid'] = mt_rand(0, 0xffff); $uuid['time_hi'] = (4 << 12) | (mt_rand(0, 0x1000)); $uuid['clock_seq_hi'] = (1 << 7) | (mt_rand(0, 128)); $uuid['clock_seq_low'] = mt_rand(0, 255); for ($i = 0; $i < 6; $i++) { $uuid['node'][$i] = mt_rand(0, 255); } $uuid = sprintf('%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x', $uuid['time_low'], $uuid['time_mid'], $uuid['time_hi'], $uuid['clock_seq_hi'], $uuid['clock_seq_low'], $uuid['node'][0], $uuid['node'][1], $uuid['node'][2], $uuid['node'][3], $uuid['node'][4], $uuid['node'][5] ); return $uuid; } ?> 

感谢任何能够帮助我的人。

从这个 PHP手册的评论中,你可以使用这个:

 function gen_uuid() { return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x', // 32 bits for "time_low" mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), // 16 bits for "time_mid" mt_rand( 0, 0xffff ), // 16 bits for "time_hi_and_version", // four most significant bits holds version number 4 mt_rand( 0, 0x0fff ) | 0x4000, // 16 bits, 8 bits for "clk_seq_hi_res", // 8 bits for "clk_seq_low", // two most significant bits holds zero and one for variant DCE1.1 mt_rand( 0, 0x3fff ) | 0x8000, // 48 bits for "node" mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ) ); } 

不是把它分解成单独的字段,而是更容易生成一个随机的数据块并改变单个字节的位置。 您还应该使用比mt_rand()更好的随机数生成器。

根据RFC 4122 – 第4.4节 ,您需要更改这些字段:

  1. time_hi_and_version (第7个八位字节的第4-7位),
  2. clock_seq_hi_and_reserved (第9个八位字节的第6和7位)

所有其他的122位应该是足够随机的。

下面的方法使用openssl_random_pseudo_bytes()生成128位随机数据​​,在八位组上进行排列,然后使用bin2hex()vsprintf()来进行最终的格式化。

 function guidv4($data) { assert(strlen($data) == 16); $data[6] = chr(ord($data[6]) & 0x0f | 0x40); // set version to 0100 $data[8] = chr(ord($data[8]) & 0x3f | 0x80); // set bits 6-7 to 10 return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4)); } echo guidv4(openssl_random_pseudo_bytes(16)); 

使用PHP 7,使用random_bytes()生成随机字节序列更简单:

 echo guidv4(random_bytes(16)); 

任何人使用composer php依赖关系,你可能要考虑这个库: https : //github.com/ramsey/uuid

它并没有比这更容易:

 Uuid::uuid4(); 

在unix系统上,使用系统内核为你生成一个uuid。

 file_get_contents('/proc/sys/kernel/random/uuid') 

信用Samveen在https://serverfault.com/a/529319/210994

注意!:使用这种方法得到一个uuid实际上耗尽了熵池,非常快! 我会避免在经常使用的地方使用它。

我的回答是基于评论uniqid用户评论,但它使用openssl_random_pseudo_bytes函数来生成随机string,而不是从/dev/urandom

 function guid() { $randomString = openssl_random_pseudo_bytes(16); $time_low = bin2hex(substr($randomString, 0, 4)); $time_mid = bin2hex(substr($randomString, 4, 2)); $time_hi_and_version = bin2hex(substr($randomString, 6, 2)); $clock_seq_hi_and_reserved = bin2hex(substr($randomString, 8, 2)); $node = bin2hex(substr($randomString, 10, 6)); /** * Set the four most significant bits (bits 12 through 15) of the * time_hi_and_version field to the 4-bit version number from * Section 4.1.3. * @see http://tools.ietf.org/html/rfc4122#section-4.1.3 */ $time_hi_and_version = hexdec($time_hi_and_version); $time_hi_and_version = $time_hi_and_version >> 4; $time_hi_and_version = $time_hi_and_version | 0x4000; /** * Set the two most significant bits (bits 6 and 7) of the * clock_seq_hi_and_reserved to zero and one, respectively. */ $clock_seq_hi_and_reserved = hexdec($clock_seq_hi_and_reserved); $clock_seq_hi_and_reserved = $clock_seq_hi_and_reserved >> 2; $clock_seq_hi_and_reserved = $clock_seq_hi_and_reserved | 0x8000; return sprintf('%08s-%04s-%04x-%04x-%012s', $time_low, $time_mid, $time_hi_and_version, $clock_seq_hi_and_reserved, $node); } // guid 

受broofa的答案启发。

 preg_replace_callback('/[xy]/', function ($matches) { return dechex('x' == $matches[0] ? mt_rand(0, 15) : (mt_rand(0, 15) & 0x3 | 0x8)); } , 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'); 

或者如果无法使用匿名function。

 preg_replace_callback('/[xy]/', create_function( '$matches', 'return dechex("x" == $matches[0] ? mt_rand(0, 15) : (mt_rand(0, 15) & 0x3 | 0x8));' ) , 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'); 

从汤姆,在http://www.php.net/manual/en/function.uniqid.php

 $r = unpack('v*', fread(fopen('/dev/random', 'r'),16)); $uuid = sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x', $r[1], $r[2], $r[3], $r[4] & 0x0fff | 0x4000, $r[5] & 0x3fff | 0x8000, $r[6], $r[7], $r[8]) 

如何使用MySQL来为您生成uuid?

 $conn = new mysqli($servername, $username, $password, $dbname, $port); $query = 'SELECT UUID()'; echo $conn->query($query)->fetch_row()[0]; 

在我寻找一个创build一个v4的uuid,我首先到这个页面,然后在http://php.net/manual/en/function.com-create-guid.php

 function guidv4() { if (function_exists('com_create_guid') === true) return trim(com_create_guid(), '{}'); $data = openssl_random_pseudo_bytes(16); $data[6] = chr(ord($data[6]) & 0x0f | 0x40); // set version to 0100 $data[8] = chr(ord($data[8]) & 0x3f | 0x80); // set bits 6-7 to 10 return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4)); } 

信用:pavel.volyntsev

如果你使用CakePHP你可以使用它们的方法CakeText::uuid(); 从CakeText类生成一个RFC4122 uuid。

相反,我知道,但这是我的答案:

  function NewGuid() { if (function_exists('com_create_guid')){ /** * @var Guid $uuid */ $uuid = com_create_guid(); print "com created"; return $uuid; } else { mt_srand((double)microtime()*10000); $charid = strtoupper(md5(uniqid(rand(), true))); $hyphen = chr(45); /** * @var Guid $uuid */ $uuid = substr($charid, 0, 8).$hyphen .substr($charid, 8, 4).$hyphen .substr($charid,12, 4).$hyphen .substr($charid,16, 4).$hyphen .substr($charid,20,12); return $uuid; } }