├── .gitignore
├── README.md
├── examples
    ├── lowersax.php
    ├── simple.php
    └── snippet.php
└── src
    ├── Incidence.php
    └── LowerSax.php


/.gitignore:
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1 | examples/data.json
2 | 


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/README.md:
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 1 | # PHP-Inzidenz-Ampel
 2 | 
 3 | Eine Inzidenz-Ampel mit Werten des RKI. Beschrieben im Artikel [Corona-Ampel](https://ct.de/yw1c) in c’t 9/2021 ab Seite 160.
 4 | 
 5 | ## Beispiel ausprobieren
 6 | 
 7 | Laden Sie die Inhalte des Repos herunter und navigieren Sie in den Ordner. Starten Sie dann einen lokalen Entwicklungsserver mit:
 8 | 
 9 | ```
10 | php -S localhost:8000
11 | ```
12 | 
13 | Im Browser unter der Adresse http://localhost:8000/examples/simple.php finden Sie eine simple Tabelle. Unter http://localhost:8000/examples/snippet.php sehen Sie eine Inzidenz-Ampel.
14 | Im Ordner `examples` finden Sie die Dateien. Passen Sie die Regions-ID wie im Artikel beschrieben an.
15 | 
16 | ## Verwenden auf der eigenen Website
17 | 
18 | Sie brauchen die Datei `src/Incidence.php`, die Sie in Ihrem Dokument per `include()` einbinden. Verwenden Sie zum Beispiel die Datei `examples/snippet.php` als Schnipsel in Ihrer Seite, um eine Ampel darzustellen.


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/examples/lowersax.php:
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 1 | <?php
 2 | include('../src/LowerSax.php');
 3 | 
 4 | 
 5 | // Um die genaue Schreibweise des Landkreises zu ermitteln, laden Sie die CSV-Datei herunter und suchen Sie darin nach dem Landkreis. Hannover wird zum Beispiel über 'Hannover, Region' gefunden. Die CSV-Datei finden Sie hier:
 6 | //https://www.apps.nlga.niedersachsen.de/corona/download.php?csv_tag_region-file
 7 | 
 8 | $data = getData("Hannover, Region", 0);
 9 | 
10 | //Die Datenfelder sind kompatibel zur RKI-Klasse 'Incidence'
11 | 
12 | //Nur eine simple Ausgabe der Daten:
13 | echo "<pre>";
14 | print_r($data);
15 | echo "</pre>";
16 | 


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/examples/simple.php:
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 1 | <?php
 2 | include('../src/Incidence.php');
 3 | 
 4 | # Find your region here and get the OBJECTID: 
 5 | # https://npgeo-corona-npgeo-de.hub.arcgis.com/datasets/917fc37a709542548cc3be077a786c17_0
 6 | 
 7 | $id = 27; // Hannover
 8 | $cache_file = './data.json';
 9 | $incidence = new Incidence($id, $cache_file);
10 | 
11 | $today = $incidence->getDaily(0);
12 | 
13 | echo "
14 | <table border='1'>
15 | <tr><td colspan='2'>" . $today['GEN'] . "</td></tr>
16 | <tr><td>7-Tage-Inzidenz</td><td>" . round($today['cases7_per_100k'], 2) . "</td></tr>
17 | <tr><td>Fälle insgesamt</td><td>" . $today['cases'] . "</td></tr>
18 | <tr><td>Fälle letzte 7 Tage</td><td>" . $today['cases7_lk'] . "</td></tr>
19 | <tr><td>Tote</td><td>" . $today['deaths'] . "</td></tr>
20 | <tr><td colspan='2'>" . $today['BL'] . "</td></tr>
21 | <tr><td>7-Tage-Inzidenz</td><td>" . round($today['cases7_bl_per_100k'], 2) . "</td></tr>
22 | <tr><td>Fälle letzte 7 Tage</td><td>" . $today['cases7_bl'] . "</td></tr>
23 | </table>";
24 | 


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/examples/snippet.php:
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  1 | <?php
  2 | include('../src/Incidence.php');
  3 | 
  4 | ### Configure here ###
  5 | 
  6 | # Find your region here and get the OBJECTID: 
  7 | # https://npgeo-corona-npgeo-de.hub.arcgis.com/datasets/917fc37a709542548cc3be077a786c17_0
  8 | $id = 27; //Hannover
  9 | $cache_file = './data.json';
 10 | $threshold = 100;
 11 | 
 12 | 
 13 | ### End of configs ###
 14 | 
 15 | 
 16 | $incidence = new Incidence($id, $cache_file);
 17 | 
 18 | $today = $incidence->getDaily(0);
 19 | 
 20 | echo "<div class='widget'>";
 21 | 
 22 | echo "<h3>Inzidenz-Ampel für " . $today['GEN'] . "</h3>";
 23 | echo "<h6>(Fälle pro 100.000 Einwohner in 7 Tagen)</h6>";
 24 | 
 25 | drawStoplight($today, $threshold);
 26 | 
 27 | echo "<table id='tbl_incidence'>";
 28 | echo drawLine($today);
 29 | echo drawLine($incidence->getDaily(1));
 30 | echo drawLine($incidence->getDaily(2));
 31 | echo "</table>";
 32 | echo "<h6>Quelle: <a href='https://www.rki.de/DE/Home/homepage_node.html'>RKI</a></h6>";
 33 | echo "</div>";
 34 | 
 35 | function drawLine($data)
 36 | {
 37 |     if ($data) {
 38 | 
 39 |         $inc = round($data['cases7_per_100k'], 2);
 40 |         if ($inc < 100) {
 41 |             $co = "value_ok";
 42 |         } else {
 43 |             $co = "value_stop";
 44 |         }
 45 | 
 46 |         echo "<tr>
 47 |                 <td>" . germanDay($data['ts']) . ", " . date("d.m.Y", $data['ts']) . "</td>
 48 |                 <td class='" . $co . "'>" . round($data['cases7_per_100k'], 2) . "</td>
 49 |             </tr>";
 50 |     }
 51 | }
 52 | 
 53 | function drawStoplight($data, $threshold)
 54 | {
 55 |     if ($data['cases7_per_100k'] > $threshold) {
 56 |         $color = "stoplight_stop";
 57 |         $text = "Geschlossen";
 58 |     } else {
 59 |         $color = "stoplight_ok";
 60 |         $text = "Geöffnet";
 61 |     }
 62 |     echo "<div id='div_stoplight' class='" . $color . "'>";
 63 |     echo $text;
 64 |     echo "</div>";
 65 | }
 66 | 
 67 | function germanDay($ts)
 68 | {
 69 |     $d = [
 70 |         1 => "Montag",
 71 |         2 => "Dienstag",
 72 |         3 => "Mittwoch",
 73 |         4 => "Donnerstag",
 74 |         5 => "Freitag",
 75 |         6 => "Samstag",
 76 |         7 => "Sonntag"
 77 |     ];
 78 |     return $d[date("N", $ts)];
 79 | }
 80 | 
 81 | ?>
 82 | <style>
 83 |     body,
 84 |     html {
 85 |         font-family: Arial, Helvetica, sans-serif;
 86 |     }
 87 | 
 88 |     h3 {
 89 |         text-align: center;
 90 |         margin: 1%;
 91 |     }
 92 | 
 93 |     h6 {
 94 |         text-align: center;
 95 |         margin: 1%;
 96 |         font-size: 0.5em;
 97 |     }
 98 | 
 99 |     .widget {
100 |         width: 250px;
101 |         border: thin solid #ccc;
102 |         min-height: 300px;
103 |     }
104 | 
105 |     #tbl_incidence {
106 |         width: 100%;
107 |         text-align: center;
108 |     }
109 | 
110 |     #tbl_incidence td {
111 |         width: 50%;
112 |         border-bottom: thin solid #ccc;
113 |     }
114 | 
115 | 
116 | 
117 |     #div_stoplight {
118 |         margin-top: 5%;
119 |         margin-bottom: 5%;
120 |         padding-top: 5%;
121 |         width: 100%;
122 |         height: 50px;
123 |         text-align: center;
124 |         vertical-align: middle;
125 |         font-size: 2em;
126 |         color: #ccc;
127 |     }
128 | 
129 |     .stoplight_stop {
130 |         background-color: darkred;
131 |     }
132 | 
133 |     .stoplight_ok {
134 |         background-color: darkgreen;
135 |     }
136 | 
137 |     .value_stop {
138 |         color: darkred;
139 |     }
140 | 
141 |     .value_ok {
142 |         color: darkgreen;
143 |     }
144 | </style>
145 | 


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/src/Incidence.php:
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  1 | <?php
  2 | 
  3 | class Incidence
  4 | {
  5 | 
  6 |     private $cache_file;
  7 |     private $region_id;
  8 | 
  9 |     private $fields = [
 10 |         'OBJECTID',
 11 |         'GEN',
 12 |         'BEZ',
 13 |         'BL',
 14 |         'cases',
 15 |         'deaths',
 16 |         'cases_per_population',
 17 | 
 18 |         'cases7_per_100k',
 19 |         'cases7_lk',
 20 |         'death7_lk',
 21 | 
 22 |         'cases7_bl_per_100k',
 23 |         'cases7_bl',
 24 |         'death7_bl',
 25 | 
 26 |         'last_update'
 27 |     ];
 28 | 
 29 | 
 30 |     public function __construct(int $ri, string $cache_file)
 31 |     {
 32 |         $this->cache_file = $cache_file;
 33 |         $this->region_id = $ri;
 34 |     }
 35 | 
 36 |     public function getDaily($offset = 0)
 37 |     {
 38 |         $d = new DateTime("today -" . $offset . " day");
 39 |         $dt = $d->format('Ymd');
 40 | 
 41 |         $c = $this->getCache($dt);
 42 |         if (is_array($c)) {
 43 |             $c['cached'] = true;
 44 |             return $c;
 45 |         }
 46 |         $c = $this->fetchData($dt);
 47 |         if (is_array($c)) {
 48 |             $c['cached'] = false;
 49 |             return $c;
 50 |         }
 51 |     }
 52 | 
 53 |     private function getCache(string $dt)
 54 |     {
 55 |         $f = @file_get_contents($this->cache_file);
 56 | 
 57 |         if ($f == false) {
 58 |             return;
 59 |         }
 60 | 
 61 |         $data = json_decode($f, true);
 62 |         if (isset($data[$dt])) {
 63 |             return $data[$dt];
 64 |         } else {
 65 |             return;
 66 |         }
 67 |     }
 68 | 
 69 |     private function fetchData(string $dt)
 70 |     {
 71 |         $fieldstr = implode(",", $this->fields);
 72 | 
 73 |         $c = curl_init();
 74 |         curl_setopt(
 75 |             $c,
 76 |             CURLOPT_URL,
 77 |             'https://services7.arcgis.com/mOBPykOjAyBO2ZKk/arcgis/rest/services/RKI_Landkreisdaten/FeatureServer/0/query?where=OBJECTID='
 78 |                 . $this->region_id . '&outFields=' . $fieldstr . '&returnGeometry=false&outSR=&f=json'
 79 |         );
 80 | 
 81 |         curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
 82 | 
 83 |         $result = curl_exec($c);
 84 |         if (curl_errno($c)) {
 85 |             throw new Exception("could not contact arcgis server");
 86 |         }
 87 |         curl_close($c);
 88 | 
 89 |         $json = json_decode($result, true);
 90 | 
 91 |         if (!isset($json['features'][0]['attributes'])) {
 92 |             return;
 93 |         }
 94 | 
 95 |         $data = $json['features'][0]['attributes'];
 96 |         $date = DateTime::createFromFormat("d.m.Y, H:i", str_replace(" Uhr", "", $data['last_update']));
 97 |         $data['ts'] = $date->format("U");
 98 |         $set = $this->setCache($data);
 99 |         if ($set == $dt) {
100 |             return $data;
101 |         } else {
102 |             return;
103 |         }
104 |     }
105 | 
106 |     private function setCache($data)
107 |     {
108 |         $f = @file_get_contents($this->cache_file);
109 |         if ($f == false) {
110 |             $old = [];
111 |         } else {
112 |             $old = json_decode($f, true);
113 |         }
114 |         $date = DateTime::createFromFormat("d.m.Y, H:i", str_replace(" Uhr", "", $data['last_update']));
115 |         $key = $date->format("Ymd");
116 |         $old[$key] = $data;
117 |         file_put_contents($this->cache_file, json_encode($old));
118 |         return $key;
119 |     }
120 | }
121 | 


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/src/LowerSax.php:
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 1 | <?php
 2 | function getData($city, $offset = 0)
 3 | {
 4 |     $date = new DateTime("today -" . $offset . " day");
 5 |     $t = $date->format("U");
 6 | 
 7 |     $f = @file_get_contents('./nds.json');
 8 |     if ($f === false) {
 9 |         getFresh($t, $city);
10 |     }
11 |     $cached = json_decode($f, true);
12 | 
13 |     if (isset($cached[$t])) {
14 |         $cc = $cached[$t];
15 |         $cc['cached'] = 1;
16 |         return $cc;
17 |     }
18 | 
19 |     return getFresh($t, $city);
20 | }
21 | 
22 | function getFresh($ts, $city)
23 | {
24 |     $csv = @file_get_contents('https://www.apps.nlga.niedersachsen.de/corona/download.php?csv_tag_region-file');
25 | 
26 |     $lines = explode("\n", $csv);
27 | 
28 |     $array = array();
29 |     foreach ($lines as $line) {
30 | 
31 |         $d = str_getcsv($line, ";");
32 |         if (isset($d[3]) and $d[3] == $city) {
33 |             $date = DateTime::createFromFormat("d.m.Y, h:i", $d[0] . ", 00:00");
34 |             $ts = $date->format('U');
35 | 
36 |             $d['cases7_per_100k'] = $d[6];
37 |             $d['ts'] = $ts;
38 |             $array[$ts] = $d;
39 |         }
40 |     }
41 | 
42 |     if (isset($array[$ts])) {
43 |         file_put_contents("./nds.json", json_encode($array));
44 |     }
45 |     return $array[$ts];
46 | }
47 | 


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