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<?php |
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/* |
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* GeoPo Encode in PHP |
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* @author : Shintaro Inagaki |
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* @param $location (Array) |
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* @return $geopo (String) |
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*/ |
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function geopoEncode($lat, $lng) |
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{ |
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// 64characters (number + big and small letter + hyphen + underscore) |
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$chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_"; |
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|
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$geopo = ""; |
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$scale = 7; |
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|
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// Change a degree measure to a decimal number |
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$lat = ($lat + 90) / 180 * pow(8, 10); |
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$lng = ($lng + 180) / 360 * pow(8, 10); |
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// Compute a GeoPo code from head and concatenate |
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for ($i = 0; $i < $scale; $i++) { |
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$geopo .= substr($chars, floor($lat / pow(8, 9 - $i) % 8) + floor($lng / pow(8, 9 - $i) % 8) * 8, 1); |
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} |
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return $geopo; |
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} |
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|
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|
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$conn = pg_connect("dbname=bus user=postgres password=snmc"); |
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if (!$conn) { |
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echo "An error occured.\n"; |
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exit; |
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} |
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if ($_REQUEST['newlatlng']) { |
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$latlng = explode(";", $_REQUEST['newlatlng']); |
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$lat = (float)$latlng[0]; |
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$lng = (float)$latlng[1]; |
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|
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$geoPo = geopoEncode($lat, $lng); |
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$nodelat = (int)($lat * 10000000); |
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$nodelon = (int)($lng * 10000000); |
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echo($nodelat . "," . $nodelon . "=$geoPo<br>"); |
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$sql = "INSERT INTO stops (geohash,lat,lng) VALUES ('$geoPo', '$nodelat', '$nodelon')"; |
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$result = pg_query($conn, $sql); |
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if (!$result) { |
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echo("Error in SQL query: " . pg_last_error() . "<br>\n"); |
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} else { |
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echo "Inserted new point at $geoPo <br>"; |
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} |
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} |
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flush(); |
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?> |