You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58 lines
5.6 KiB
58 lines
5.6 KiB
<?php
|
|
|
|
function meters($lat1, $lng1, $lat2, $lng2): float
|
|
{
|
|
$earth_radius = 6378137; // Radius of the Earth in meters :
|
|
$rlo1 = deg2rad($lng1); //Transform the coordinate longitude1 from degree to radian
|
|
$rla1 = deg2rad($lat1); //Transform the coordinate latitude1 from degree to radian
|
|
$rlo2 = deg2rad($lng2); //Transform the coordinate longitude2 from degree to radian
|
|
$rla2 = deg2rad($lat2); //Transform the coordinate latitude2 from degree to radian
|
|
$dlo = ($rlo2 - $rlo1) / 2; //Stock in $dlo the result of the calcul : ($rlo2 - $rlo1) / 2
|
|
$dla = ($rla2 - $rla1) / 2; //Stock in $dla the result of the calcul : ($rla2 - $rla1) / 2
|
|
$a = (sin($dla) * sin($dla)) + cos($rla1) * cos($rla2) * (sin($dlo) * sin($dlo)); //Do some operations to return the distance in meters
|
|
$d = 2 * atan2(sqrt($a), sqrt(1 - $a)); //Do some operations to return the distance in meters
|
|
return round($earth_radius * $d); // Return the distance in meters between 2 GPS points
|
|
}
|
|
$connect=""; //Else PHP send an error, "connect don't exist", but that work anyway, this is just to remove a fake error
|
|
$res=include "config.php"; //$res get the result of the calling of "config.php"
|
|
if ($res != 1){ //Check if config.php work
|
|
print (json_encode("Failed to connect to MySQL, connection timeout")); //Return a json string, so the dart script can interpret the error
|
|
}
|
|
if (!empty($_POST)) {
|
|
$id = $_POST['id']; //Get the result of the POST method in id
|
|
$query = 'SELECT * FROM gps'; //Browse all the database
|
|
$results = mysqli_query($connect, $query); //Execute the SQL command
|
|
$lat1 = 0; //Set $lat1 to test if the user exist
|
|
$lng1 = 0; //Set $lng1 to test if the user exist
|
|
$listUser = []; //Set the listUser to an empty list
|
|
while ($row = $results->fetch_row()){ //For all the row in the database
|
|
if (strcmp($row[0], $id) == 0) { //If the user is found in the database
|
|
$lat1 = $row[1]; //Set $lat1 to the latitude of the current user
|
|
$lng1 = $row[2]; //Set $lng1 to the longitude of the current user
|
|
}
|
|
}
|
|
if ($lat1 == 0 && $lng1 == 0) { //Check if the user get found in the database
|
|
print(json_encode("ERROR No user found in the database")); //Return a json string, so the dart script can interpret the error
|
|
exit(1); //Exit the actual script
|
|
}
|
|
$results = mysqli_query($connect, $query); //Execute again the SQL command to restart the fetch_row()
|
|
while ($row = $results->fetch_row()) { //For all the row in the database
|
|
if (strcmp($row[0], $id) != 0) { //If the row is not the row of the current user
|
|
$lat2 = $row[1]; //Set $lat2 to the latitude of the user who is in the actual row
|
|
$lng2 = $row[2]; //Set $lng2 to the latitude of the user who is in the actual row
|
|
$userID = $row[0]; //Set $userID to the username of the user who is in the actual row
|
|
$idMusic = $row[3]; //Set $idMusic to the id of the actual song of the user who is in the actual row
|
|
$dist = meters($lat1, $lng1, $lat2, $lng2); //With the function meters, calcul of the distance between the current user and the user who is in the actual row
|
|
if ($dist <= 100) { //If the user in the actual row is less than 100 meters away of the current user
|
|
$listUser[] = ['user' => $userID, 'music' => $idMusic]; //Add the username and the ID of the song that user who is in the actual row is listening
|
|
}
|
|
}
|
|
}
|
|
print(json_encode($listUser)); //Return a json string of the list listUser
|
|
}else{ //If the method POST return nothing
|
|
print (json_encode("The POST didn't return any values")); //Return a json string, so the dart script can interpret the error
|
|
}
|
|
|
|
|
|
|