Rule 110

rule110

<?php

$lines = array();
$first_line = array_fill(0, 51, '*');
$first_line[24] = '/';
$lines[] = $first_line;

$rules = array(
    '///'=> '*',
    '//*' => '/',
    '/*/'=> '/',
    '/**' =>'*',
    '*//'=> '/',
    '*/*' => '/',
    '**/'=> '/',
    '***' => '*'
);

for ($i = 0; $i< 10; $i++)
{
    $line = array();
    for($j = 0; $j< 51; $j++)
    {
        $pattern = (string)implode('', array_slice(end($lines), $j - 1, 3));

        $value = (strlen($pattern) == 3 && isset($rules[$pattern])) ? $rules[$pattern] : '*';
        $line[] = $value;
    }
    $lines[] = $line;
}

foreach ($lines as $line)
{
    foreach ($line as $piece)
    {
        echo $piece;
    }
    echo "\n";
}