class.ilRandom.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */
 
class ilRandom
{
    private $logger = null;
 
    public function __construct()
    {
    }
 
    private function logIfPossible(callable $c)
    {
        global $DIC;
 
        if (isset($DIC['ilLoggerFactory'])) {
            $c($DIC->logger()->rnd());
        }
    }
 
    public function int($min = null, $max = null)
    {
        if(is_null($min)) {
            $min = 0;
        }
        if(is_null($max)) {
            $max = mt_getrandmax();
        }
 
        if($this->supportsRandomInt()) {
            try {
                return random_int($min, $max);
            } catch (Exception $e) {
                $this->logIfPossible(static function (ilLogger $logger) {
                    $logger->logStack(\ilLogLevel::ERROR);
                    $logger->error('No suitable random number generator found.');
                });
                throw $e;
            } catch (Throwable $e) {
                $this->logIfPossible(static function (ilLogger $logger) {
                    $logger->logStack(\ilLogLevel::ERROR);
                    $logger->error('max should be greater than min.');
                });
                throw $e;
            }
        }
        // version 5.6 => use mt_rand
        return mt_rand($min, $max);
    }
 
    private function supportsRandomInt()
    {
        if(version_compare(PHP_VERSION , '7.0.0', '>=')) {
            return true;
        }
        return false;
    }
 
}