PHP files

connection.php
<?php
	$db_name = "aplikacja treningowa";
	$mysql_username = "root";
	$mysql_password = "";
	$server_name = "localhost";
	$connection = mysqli_connect($server_name, $mysql_username, $mysql_password, $db_name);
?>

get_all.php
<?php
	require "connection.php";
	$response = array();
	$mysql_query = "SELECT *FROM map_data";
	$result = mysqli_query($connection, $mysql_query);
	if(mysqli_num_rows($result) > 0) {
		$response["map_data"] = array();
		while($row = mysqli_fetch_array($result)) {
			$stat = array();
			$stat["id"] = $row[0];
			$stat["mode"] = $row[1];
			$stat["distance"] = $row[2];
			$stat["calories"] = $row[3];
			array_push($response["map_data"], $stat);
		}
		$response["success"] = 1;
	}
	$connection->close();
?>