Message Decoder

<?php
$jsonTable = json_decode($_GET['jsonTable']);
$columns = (int)$jsonTable[0];
$timePattern = '/^\s*Reply\s+from\s+\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\s*\: bytes=\d{1,4}\s+time=\s*(\d+)\s*ms\s+TTL=\d{1,4}\s*$/';

$message = '';
for ($i = 1; $i < count($jsonTable[1]); $i++) {
    $ping = $jsonTable[1][$i];
    preg_match($timePattern, $ping, $matches);
    $milliseconds = (int)$matches[1];
    $message .= chr($milliseconds);
}

$words = explode('*', $message);
$style = "style='background:#CAF'";
echo '<table border=\'1\' cellpadding=\'5\'>';
foreach ($words as $word) {
    $rows = ceil(strlen($word) / $columns);
    $charCounter = 0;
    for ($i = 0; $i < $rows; $i++) {
        echo '<tr>';
        for ($col = 0; $col < $columns; $col++) {
            if ($charCounter < strlen($word) && $word[$charCounter] != ' ') {
                echo "<td {$style}>" . htmlspecialchars($word[$charCounter]) . '</td>';
            } else {
                echo '<td></td>';
            }
            $charCounter++;
        }
        echo '</tr>';
    }
}
echo '</table>';