1-D cellular automat. Call as cell.php <rule 0-255 or "loop"> <initial 64bit signed int>

cell.php

<?php

$rule = $argv[1] ?? null;
$initial = $argv[2] ?? null;
$cellsCount = 64;
$loop = false;
$loopSteps = 50;


function randInitial($cellsCount) {
  $initial = '';
  while ($cellsCount--) {
      $initial .= (string) mt_rand(0, 1);
  }
  return $initial;
}

if ($rule === 'loop') {
    $loop = true;
    $rule = null;
}
$resetInitial = isset($initial);
$initial = $resetInitial ? decbin((int) $initial) : null;

do {
  if ($loop) {
    $rule = $rule ?? -1;
    $rule++;
    $loop = $rule < 255;
    $initial = $resetInitial ? null : $initial;
  } else {
    $rule = $rule ?? rand(0,255);
  }

  $initial = $initial ?? randInitial($cellsCount);
  

  echo sprintf("Rule: %d\n", $rule);

  $row = [];
  for ($i = 0; $i < $cellsCount; $i++) {
  	$row[] = (bool) ($initial[$i] ?? false);
  }

  $counter = $loopSteps;
  while (!$loop || $counter--) {
  	$nextRow = [];
      $empty = true;
  	foreach ($row as $i => $cell) {
          if ($cell) {
              $empty = false;
          }
  		echo $cell ? '*' : ' ';
  		$prev = ($cellsCount + $i - 1) % $cellsCount;
  		$next = ($i + 1) % $cellsCount;
  		$state = (int) $row[$prev] . (int) $cell . (int) $row[$next];
  		$nextRow[] = (bool) ((2 ** bindec($state)) & $rule);
  	}
  	echo "\n";
    if ($empty) {
        //echo "and nothing has left...\n";
        //break;
    }
  	usleep(100000);
  	$row = $nextRow;
  }
  usleep(100000);

} while ($loop);