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<?php |
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namespace Fwolf\Util\Uuid; |
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/** |
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* UUID generator using base-36 character, short version |
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* |
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* {@see Base36} algorithm is good, but the uuid is still too long. For small |
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* scale system, we may need this short version. |
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* |
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* The second and microsecond part remain same length and algorithm, to keep |
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* maximum usage of PHP microtime precision, so the lifetime and timestamp |
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* offset are also same. |
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* |
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* As a small scale, we reduce: |
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* - length of group from 2 to 1, maximum 36 servers |
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* - length of custom from 7 to 0 |
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* - length of random from 6 to 5 |
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* |
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* Random part need to ensure no duplicate in 0.000001 second, we use decimal |
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* part of {@see uniqid()} with more_entropy enabled. as its integer part is |
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* generated base on microtime. We got a 8 digit number, enough to avoid dup in |
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* 1 microsecond. The largest number 99,999,999 in base36 is '1n.chr' cost 6 |
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* bytes, so we divide it by 2 to use 5 bytes storage, should be enough too. |
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* |
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* Length of UUID is 16 bytes, no separator. |
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* |
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* |
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* For safe speed in 1 microsecond (not millisecond), reference: |
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* |
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* @see http://github.com/mumrah/flake-java 1k / millisecond = 1/ms |
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* @see https://github.com/twitter/snowflake/tree/snowflake-2010 |
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* 0.5/ms |
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* |
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* |
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* @copyright Copyright 2015-2016 Fwolf |
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* @license http://opensource.org/licenses/MIT MIT |
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*/ |
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class Base36Short extends Base36 |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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const LENGTH = 16; |
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/** |
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* {@inheritdoc} |
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*/ |
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const LENGTH_SECOND = 6; |
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/** |
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* {@inheritdoc} |
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*/ |
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const LENGTH_MICROSECOND = 4; |
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/** |
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* {@inheritdoc} |
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*/ |
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const LENGTH_GROUP = 1; |
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/** |
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* {@inheritdoc} |
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*/ |
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const LENGTH_CUSTOM = 0; |
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/** |
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* {@inheritdoc} |
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*/ |
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const LENGTH_RANDOM = 5; |
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/** |
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* {@inheritdoc} |
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*/ |
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const LENGTH_CHECK_DIGIT = 0; |
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/** |
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* {@inheritdoc} |
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*/ |
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const SEPARATOR = ''; |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function generateRandomPart() |
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{ |
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$decimalPart = substr(uniqid('', true), -8); |
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$decimalPart = round($decimalPart / 2); |
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$encoded = base_convert($decimalPart, 10, 36); |
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$random = str_pad($encoded, static::LENGTH_RANDOM, '0', STR_PAD_LEFT); |
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return $random; |
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} |
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} |
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fwolf /
uuid.php
