moduloBias.php

<?php

function crypto_rand_secure($min, $max)
{
     $range = $max - $min;
      if ($range < 1) return $min; // not so random...
      $log = ceil(log($range, 2));
      $bytes = (int) ($log / 8) + 1; // length in bytes
       $rnd = hexdec(bin2hex(openssl_random_pseudo_bytes($bytes)));
        return $min + $rnd%$range;
}

$min = 0;
$max = 100;
//set up an array to store results
$distribution = array();
//initialize array to 0
for($i = 0; $i < $max; $i++) {
    $distribution[$i] = 0;
}

//run the test
for($i=0; $i < 1000000; $i++) {
    $result = crypto_rand_secure(0,100);
    $distribution[$result]++;
}

var_dump($distribution);