TransactionIdentifier.php

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<?php
namespace Wikimedia\Rdbms;
 
class TransactionIdentifier {
    private $id = '';
 
    public function __construct() {
        static $nextId;
        $nextId = ( $nextId !== null ? $nextId++ : mt_rand() ) % 0xffff;
        $this->id = sprintf( '%06x', mt_rand( 0, 0xffffff ) ) . sprintf( '%04x', $nextId );
    }
 
    public function __toString() {
        return $this->id;
    }
}