Arduino-Scrolltext-Weather-Report/scroll.php

<?php
ini_set("display_errors", 1);
error_reporting(E_ALL);
if(isset($_GET['update'])) echo "Update!";

$name = array("Mon" => "Mo", "Tue" => "Di", "Wed" => "Mi", "Thu" => "Do", "Fri" => "Fr", "Sat" => "Sa", "Sun" => "So");
$cache_file = "data.txt";
$url = 'http://api.openweathermap.org/data/2.5/forecast/daily?id=<YourTownId>&appid=<YourAppId>&units=metric';

if (!isset($_GET['update']) && file_exists($cache_file) && (filemtime($cache_file) > (time() - 60 * 30 ))) {
   // Cache file is less than five minutes old. 
   // Don't bother refreshing, just use the file as-is.
   $txt = file_get_contents($cache_file);
} else {
   // Our cache is out-of-date, so load the data from our remote server,
   // and also save it over our cache for next time.
	$data = json_decode(file_get_contents($url));
	$str = "Keine Daten gefunden!";
	if(!empty($data->city->name)) {
		$str="";
		foreach($data->list as $day) {
			$dt = $name[date("D", $day->dt)];
			$temp = number_format($day->temp->day, 1, ',', '');
			$min = number_format($day->temp->min, 0, ',', '');
			$max = number_format($day->temp->max, 0, ',', '');
			$wlk = $day->weather[0]->description;
			if(isset($day->rain)) $rain = $day->rain; else $rain = 0;
			if(isset($day->snow)) $snow = $day->snow; else $snow = 0;
			if($rain + $snow > 0.05) $ns = number_format($rain + $snow, 2, ',', '') . "mm"; else $ns = "";
			$str.="$dt: $min-$max" . "°C $wlk $ns ";
		}
	} else {
	}
		//echo "<pre>" . json_encode($data, JSON_PRETTY_PRINT) . "</pre>";
	//echo $str;

	//$str = substr($str,0,123);//126
	$img_width = strlen($str)*5;
	$im = imagecreatetruecolor($img_width, 5);
	
	// Initialise colours;
	$black = imagecolorallocate($im, 0, 0, 0);
	$white = imagecolorallocate($im, 255, 255, 255);
	$size = imagettftext($im, 4, 0, 5, 5, $white, "/var/www/led/5by5.ttf", $str);
	if ($size[2] < 615) $width = $size[2]; else $width = 615;
	imagetruecolortopalette($im, false, 2);
	$txt = "";
	for($y=0; $y<5; $y++) {
	  $txt .= "\n";
	  $byte=0;
	  $index=0;
	  for($x=0;$x<=$width;$x++) {//chr 32 to 160
			if(imagecolorat($im, $x, $y) != $black) {
				$byte += 1 << $index;
			}
			$index++;
			if($index >= 7) {
				$index=0;
				$txt .= chr($byte+32);
				$byte=0;
			}
	  }
		if($index < 7) {
			$txt .= chr($byte+32);
		}
	  
	}
	if(isset($_GET['update'])) imagepng($im, "img.png");
	imagedestroy($im);
    file_put_contents($cache_file, $txt, LOCK_EX);
}
echo "" . $txt;
?>