$this->grid[$key] = 0;
}
break;
case 'toggle':
$this->grid[$key] += 2;
break;
}
}
}
}
/**
* Return the total brightness of all the ligts
*
* @return int
*/
public function getTotalBrightness()
{
return array_sum($this->grid);
}
}
$handle = fopen("input.txt", "r");
$grid = new lightGrid();
if ($handle) {
while (($line = fgets($handle)) !== false) {
if (preg_match('/^(?P<action>turn (on|off)|toggle)\\s(?P<x1>[0-9]+),(?P<y1>[0-9]+)\\sthrough\\s(?P<x2>[0-9]+),(?P<y2>[0-9]+)/i', $line, $matches)) {
$grid->run($matches['action'], (int) $matches['x1'], (int) $matches['y1'], (int) $matches['x2'], (int) $matches['y2']);
}
}
fclose($handle);
}
echo 'Total brightness: ' . $grid->getTotalBrightness() . PHP_EOL;
}
}
}
}
/**
* Count the number of lights that are switched on
*
* @return int
*/
public function countLightsOn()
{
$ret = 0;
foreach ($this->grid as $value) {
if (true === $value) {
$ret++;
}
}
return $ret;
}
}
$handle = fopen("input.txt", "r");
$grid = new lightGrid();
if ($handle) {
while (($line = fgets($handle)) !== false) {
if (preg_match('/^(?P<action>turn (on|off)|toggle)\\s(?P<x1>[0-9]+),(?P<y1>[0-9]+)\\sthrough\\s(?P<x2>[0-9]+),(?P<y2>[0-9]+)/i', $line, $matches)) {
$grid->run($matches['action'], (int) $matches['x1'], (int) $matches['y1'], (int) $matches['x2'], (int) $matches['y2']);
}
}
fclose($handle);
}
echo 'Number of lights that are on: ' . $grid->countLightsOn() . PHP_EOL;
