| <?php | |
| /* | |
| * GeoPo Encode in PHP | |
| * @author : Shintaro Inagaki | |
| * @param $location (Array) | |
| * @return $geopo (String) | |
| */ | |
| function geopoEncode($lat, $lng) | |
| { | |
| // 64characters (number + big and small letter + hyphen + underscore) | |
| $chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_"; | |
| $geopo = ""; | |
| $scale = 7; | |
| // Change a degree measure to a decimal number | |
| $lat = ($lat + 90) / 180 * pow(8, 10); | |
| $lng = ($lng + 180) / 360 * pow(8, 10); | |
| // Compute a GeoPo code from head and concatenate | |
| for ($i = 0; $i < $scale; $i++) { | |
| $geopo .= substr($chars, floor($lat / pow(8, 9 - $i) % 8) + floor($lng / pow(8, 9 - $i) % 8) * 8, 1); | |
| } | |
| return $geopo; | |
| } | |
| /* | |
| * GeoPo Decode in PHP | |
| * @author : Shintaro Inagaki | |
| * @param $geopo (String) | |
| * @return $location (Array) | |
| */ | |
| function geopoDecode($geopo) | |
| { | |
| // 64characters (number + big and small letter + hyphen + underscore) | |
| $chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_"; | |
| // Array for geolocation | |
| $location = array(); | |
| for ($i = 0; $i < strlen($geopo); $i++) { | |
| // What number of character that equal to a GeoPo code (0-63) | |
| $order = strpos($chars, substr($geopo, $i, 1)); | |
| // Lat/Lng plus geolocation value of scale | |
| $location['lat'] = $location['lat'] + floor($order % 8) * pow(8, 9 - $i); | |
| $location['lng'] = $location['lng'] + floor($order / 8) * pow(8, 9 - $i); | |
| } | |
| // Change a decimal number to a degree measure, and plus revised value that shift center of area | |
| $location['lat'] = $location['lat'] * 180 / pow(8, 10) + 180 / pow(8, strlen($geopo)) / 2 - 90; | |
| $location['lng'] = $location['lng'] * 360 / pow(8, 10) + 360 / pow(8, strlen($geopo)) / 2 - 180; | |
| $location['scale'] = strlen($geopo); | |
| return $location; | |
| } | |
| $conn = pg_connect("dbname=bus user=postgres password=snmc"); | |
| if (!$conn) { | |
| echo "An error occured.\n"; | |
| exit; | |
| } | |
| if ($_REQUEST['newlatlng']) { | |
| $latlng = explode(";", $_REQUEST['newlatlng']); | |
| $lat = (float)$latlng[0]; | |
| $lng = (float)$latlng[1]; | |
| $geoPo = geopoEncode($lat, $lng); | |
| $nodelat = (int)($lat * 10000000); | |
| $nodelon = (int)($lng * 10000000); | |
| echo($nodelat . "," . $nodelon . "=$geoPo<br>"); | |
| $sql = "UPDATE stops SET geohash='$geoPo', lat='$nodelat', lng='$nodelon' WHERE geohash = '{$_REQUEST['oldgeopo']}'"; | |
| $result = pg_query($conn, $sql); | |
| if (!$result) { | |
| echo("Error in SQL query: " . pg_last_error() . "<br>\n"); | |
| } else { | |
| echo $_REQUEST['oldgeopo'] . " replaced with $geoPo <br>"; | |
| $updatedroutes = 0; | |
| $result_outdatedroutes = pg_query($conn, "Select * FROM between_stops where points LIKE '%" . $_REQUEST['oldgeopo'] . ";%'"); | |
| while ($outdatedroute = pg_fetch_assoc($result_outdatedroutes)) { | |
| $newpoints = str_replace($_REQUEST['oldgeopo'], $geoPo, $outdatedroute['points']); | |
| $sql = "UPDATE between_stops set points='$newpoints' where fromlocation = '{$outdatedroute['fromlocation']}' AND tolocation = '{$outdatedroute['tolocation']}' "; | |
| $result = pg_query($conn, $sql); | |
| if (!$result) { | |
| echo("Error in SQL query: " . pg_last_error() . "<br>\n"); | |
| } | |
| $updatedroutes++; | |
| } | |
| echo "updated $updatedroutes routes<br>"; | |
| } | |
| } | |
| flush(); | |
| ?> |