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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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$geopo = ""; |
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$scale = 7; |
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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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* GeoPo Decode in PHP |
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* @author : Shintaro Inagaki |
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* @param $geopo (String) |
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* @return $location (Array) |
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*/ |
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function geopoDecode($geopo) |
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{ |
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// 64characters (number + big and small letter + hyphen + underscore) |
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$chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_"; |
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// Array for geolocation |
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$location = array(); |
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for ($i = 0; $i < strlen($geopo); $i++) { |
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// What number of character that equal to a GeoPo code (0-63) |
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$order = strpos($chars, substr($geopo, $i, 1)); |
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// Lat/Lng plus geolocation value of scale |
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$location['lat'] = $location['lat'] + floor($order % 8) * pow(8, 9 - $i); |
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$location['lng'] = $location['lng'] + floor($order / 8) * pow(8, 9 - $i); |
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} |
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// Change a decimal number to a degree measure, and plus revised value that shift center of area |
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$location['lat'] = $location['lat'] * 180 / pow(8, 10) + 180 / pow(8, strlen($geopo)) / 2 - 90; |
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$location['lng'] = $location['lng'] * 360 / pow(8, 10) + 360 / pow(8, strlen($geopo)) / 2 - 180; |
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$location['scale'] = strlen($geopo); |
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return $location; |
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} |
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$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)$latlng[1]; |
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$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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$sql = "UPDATE stops SET geohash='$geoPo', lat='$nodelat', lng='$nodelon' WHERE geohash = '{$_REQUEST['oldgeopo']}'"; |
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$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 $_REQUEST['oldgeopo'] . " replaced with $geoPo <br>"; |
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$updatedroutes = 0; |
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$result_outdatedroutes = pg_query($conn, "Select * FROM between_stops where points LIKE '%" . $_REQUEST['oldgeopo'] . ";%'"); |
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while ($outdatedroute = pg_fetch_assoc($result_outdatedroutes)) { |
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$newpoints = str_replace($_REQUEST['oldgeopo'], $geoPo, $outdatedroute['points']); |
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$sql = "UPDATE between_stops set points='$newpoints' where fromlocation = '{$outdatedroute['fromlocation']}' AND tolocation = '{$outdatedroute['tolocation']}' "; |
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$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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} |
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$updatedroutes++; |
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} |
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echo "updated $updatedroutes routes<br>"; |
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} |
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} |
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flush(); |
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?> |