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97 lines
5.6 KiB
97 lines
5.6 KiB
<?php
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function metersBetweenTwoUser($lat1, $lng1, $lat2, $lng2): float
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{
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$earth_radius = 6378137; // Radius of the Earth in meters :
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$rlo1 = deg2rad($lng1); //Transform the coordinate longitude1 from degree to radian
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$rla1 = deg2rad($lat1); //Transform the coordinate latitude1 from degree to radian
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$rlo2 = deg2rad($lng2); //Transform the coordinate longitude2 from degree to radian
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$rla2 = deg2rad($lat2); //Transform the coordinate latitude2 from degree to radian
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$dlo = ($rlo2 - $rlo1) / 2; //Stock in $dlo the result of the calcul : ($rlo2 - $rlo1) / 2
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$dla = ($rla2 - $rla1) / 2; //Stock in $dla the result of the calcul : ($rla2 - $rla1) / 2
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$a = (sin($dla) * sin($dla)) + cos($rla1) * cos($rla2) * (sin($dlo) * sin($dlo)); //Do some operations to return the distance in meters
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$d = 2 * atan2(sqrt($a), sqrt(1 - $a)); //Do some operations to return the distance in meters
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return round($earth_radius * $d); // Return the distance in meters between 2 GPS points
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}
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function insertUserAndReturnList(): array|int
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{
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include "config.php";
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$res = connection();
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if (strcmp(gettype($res),"integer")==0) {
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return 2;
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}
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$query = "CREATE TABLE IF NOT EXISTS gps (
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id varchar(30) PRIMARY KEY,
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latitude double NOT NULL,
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longitude double NOT NULL,
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idMusic varchar(100) NOT NULL,
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dateLog date NOT NULL
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);";
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mysqli_query($res, $query);
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if (!empty($_POST)) { //Check if the method POST return something
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$id = $_POST['id']; //Get the result of POST method
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$latitude = $_POST['latitude']; //Get the result of POST method
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$longitude = $_POST['longitude']; //Get the result of POST method
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$idMusic = $_POST['idMusic']; //Get the result of POST method
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$latitude = doubleval($latitude); //Convert a string to a double
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$longitude = doubleval($longitude); //Convert a string to a double
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$query = "DELETE FROM gps WHERE (TIMESTAMPDIFF(MINUTE,dateLog,CURRENT_TIMESTAMP)<10;";
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$mysqli_query($connect, $query);
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$query = "SELECT id FROM gps WHERE id = '$id' ";
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$results = mysqli_query($res, $query); //Execute the SQL command
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if (empty($results->fetch_row()[0])){
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$query = "INSERT INTO gps(id,latitude,longitude,idMusic,dateLog) VALUES('$id','$latitude','$longitude','$idMusic',CURRENT_TIMESTAMP);"; //Insert into the database the new data and new information about this user
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}else{
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$query = "UPDATE gps SET latitude='$latitude', longitude='$longitude', idMusic='$idMusic' WHERE id='$id'"; //Delete the actual line and replace this line with the next lines
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}
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mysqli_query($res, $query);
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$query = "SELECT * FROM gps WHERE id != '$id'"; //Browse all the database
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$results = mysqli_query($res, $query); //Execute the SQL command
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$listUser = []; //Set the listUser to an empty list
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while ($row = $results->fetch_row()) { //For all the row in the database
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$lat2 = $row[1]; //Set $lat2 to the latitude of the user who is in the actual row
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$lng2 = $row[2]; //Set $lng2 to the latitude of the user who is in the actual row
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$userID = $row[0]; //Set $userID to the username of the user who is in the actual row
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$idMusic = $row[3]; //Set $idMusic to the id of the actual song of the user who is in the actual row
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$dist = metersBetweenTwoUser($latitude, $longitude, $lat2, $lng2); //With the function meters, determinate the distance between the current user and the user who is in the actual row
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if ($dist <= 100) { //If the user in the actual row is less than 100 meters away of the current user
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$listUser[] = ['user' => $userID, 'music' => $idMusic]; //Add the username and the ID of the song that user who is in the actual row is listening
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}
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}
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return $listUser; //Return an array
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} else { //If the method POST return nothing
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return 3; //Return a code error
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}
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}
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print(json_encode(insertUserAndReturnList()));
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