linear-congruential-generator.php

<?php
/**
 * From http://rosettacode.org/wiki/Linear_congruential_generator#PHP
 */
function bsd_rand($seed) {
    return function() use (&$seed) {
        return $seed = (1103515245 * $seed + 12345) % (1 << 31);
    };
}

/**
 * From http://stackoverflow.com/questions/14556104/generating-a-unique-and-random-6-character-long-string-to-represent-link-in-ruby
 */
$alphas = range('a', 'z');
function encode_alphas($n, $alphas) {
  $result = '';
  for ($i=0;$i<6;$i++) {
    $m = $n % count($alphas);
    $n = $n / count($alphas);
    $result .= $alphas[$m];
  }
  return $result;
}
 
$lcg = bsd_rand(0);
echo "BSD ";
for ($i = 0; $i < 10; $i++)
    echo encode_alphas($lcg(), range('a', 'z')), " ";
echo "\n";