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58 lines
5.6 KiB
58 lines
5.6 KiB
<?php
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function meters($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 * $d); // Return the distance in meters between 2 GPS points
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}
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$connect=""; //Else PHP send an error, "connect don't exist", but that work anyway, this is just to remove a fake error
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$res=include "config.php"; //$res get the result of the calling of "config.php"
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if ($res != 1){ //Check if config.php work
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print (json_encode("Failed to connect to MySQL")); //Return a json string, so the dart script can interpret the error
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}
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if (!empty($_POST)) {
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$id = $_POST['id']; //Get the result of the POST method in id
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$query = 'SELECT * FROM gps'; //Browse all the database
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$results = mysqli_query($connect, $query); //Execute the SQL command
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$lat1 = 0; //Set $lat1 to test if the user exist
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$lng1 = 0; //Set $lng1 to test if the user exist
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$listUser = []; //Set the listUser to an empty list
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while ($row = $results->fetch_row()){ //For all the row in the database
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if (strcmp($row[0], $id) == 0) { //If the user is found in the database
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$lat1 = $row[1]; //Set $lat1 to the latitude of the current user
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$lng1 = $row[2]; //Set $lng1 to the longitude of the current user
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}
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}
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if ($lat1 == 0 && $lng1 == 0) { //Check if the user get found in the database
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print(json_encode("ERROR No user found in the database")); //Return a json string, so the dart script can interpret the error
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exit(1); //Exit the actual script
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}
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$results = mysqli_query($connect, $query); //Execute again the SQL command to restart the fetch_row()
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while ($row = $results->fetch_row()) { //For all the row in the database
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if (strcmp($row[0], $id) != 0) { //If the row is not the row of the current user
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$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 = meters($lat1, $lng1, $lat2, $lng2); //With the function meters, calcul of the distance between the current user and the user who is in the actual row
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if ($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' => $idMusic]; //Add the username and the ID of the song that user who is in the actual row is listening
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}
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}
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}
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print(json_encode($listUser)); //Return a json string of the list listUser
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}else{ //If the method POST return nothing
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print (json_encode("The POST didn't return any values")); //Return a json string, so the dart script can interpret the error
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}
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