Online PHP editor | rfc for eHKCc

<?php /* Author: Silviu Schiau (@sschiau on Twitter) Web: www.schiau.co File: Particle.php Created: 1364036124000 (UNIX Time) Modified: 1378831167000 (UNIX Time) About: PHP implementation of Twitter Snowflake ID Generator (Extended to 42bits epoch for 96 years 1 month 21 days 16 hours 42 minutes 24 seconds in the future) License: Apache License Version 2.0 http://www.apache.org/licenses/LICENSE-2.0.txt Thanks to Twitter for Snowflake. This header should NOT be removed if you want to use Particle. */ class Particle { const EPOCH=1378831167000; final public function generateParticle($machine_id) { //Time - 42 bits (millisecond precision w/ a custom epoch gives us 96 years 1 month 21 days 16 hours 42 minutes 24 seconds in the future) $time = floor(microtime(true) * 1000); //Substract custom epoch from current time $time -= self::EPOCH; //Add to base $base = pow(2,41); $base += $time; $base = decbin($base); //configured machine id - 10 bits - to 1024 machines $machineid = decbin($machine_id); //sequence number - 12 bits - up to 4096 random numbers per machine $random = mt_rand(0,pow(2,12)-1); $random = decbin($random); //Pack $base = $base.$machineid.$random; return base_convert($base,2,10); } final public function timeFromParticle($particle) { return base_convert(substr(base_convert($particle,10,2),0,42),2,10)-pow(2,41)+self::EPOCH; } } function getId($machine_id = 0, $sleep = true) { // Without sleeping 1ms two elements created at the very // same time will collide when generated on the same machine if ($sleep) { usleep(1000); } $particle = new Particle; return $particle->timeFromParticle($particle->generateParticle($machine_id)); } // We need to verify that there are no ID conflicts echo "Same machine same time\n"; echo getId(1, false) . "\n"; echo getId(1, false) . "\n"; echo getId(1, false) . "\n"; echo getId(1, false) . "\n"; echo getId(1, false) . "\n"; echo getId(1, false) . "\n"; echo "Different machine same time\n"; echo getId(10, false) . "\n"; echo getId(20, false) . "\n"; echo getId(30, false) . "\n"; echo getId(10, false) . "\n"; echo getId(20, false) . "\n"; echo getId(30, false) . "\n"; echo "Same machine different time\n"; echo getId(1) . "\n"; echo getId(1) . "\n"; echo getId(1) . "\n"; echo getId(1) . "\n"; echo getId(1) . "\n"; echo getId(1) . "\n";

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