<?php

   $con = mysqli_connect("mysql1.000webhost.com", "a3021026_patryk", "haslo123", "a3021026_wallet");

    $username = $_POST["username"];
    $password = $_POST["password"];

    $statement = mysqli_prepare($con, "SELECT * FROM user WHERE username = ? AND password = ?");
    mysqli_stmt_bind_param($statement, "ss", $username, $password);
    mysqli_stmt_execute($statement);

    mysqli_stmt_store_result($statement);
    mysqli_stmt_bind_result($statement, $userID, $name, $email, $username, $password);

    $_SESSION = array();
    $_SESSION["success"] = false;

    while(mysqli_stmt_fetch($statement)){
		session_start();
		header("http://ratcooding.site88.net/showExpense.php");
		$_SESSION["success"] = true;
        $_SESSION["name"] = $name;
        $_SESSION["email"] = $email;
        $_SESSION["username"] = $username;
        $_SESSION["password"] = $password;
    }

    echo json_encode($_SESSION);
?>

wyswietlanie

<?php


$con = mysqli_connect("mysql1.000webhost.com", "a3021026_patryk", "haslo123", "a3021026_wallet");


$sql = "select  * FROM expense";
$res = mysqli_query($con,$sql);
$result = array();
while($row = mysqli_fetch_array($res)){
array_push($result,
array('expense'=>$row[0]),
array('description'=>$row[1]
));
}
echo json_encode(array("expense"=>$result));
mysqli_close($con);
?>