private static function getWord(Arrow $arrow, GridFile $gridFile, $xStart, $yStart)
{
$word = "";
$cell = $arrow->firstCell($xStart, $yStart);
list($x, $y) = $cell;
$value = $gridFile->getCell($x, $y);
while ($x < $gridFile->getWidth() && $y < $gridFile->getHeight() && $value != strtolower($value)) {
$word .= $value;
$cell = $arrow->nextCell($x, $y);
list($x, $y) = $cell;
$value = $gridFile->getCell($x, $y);
}
return $word;
}
