$_SESSION 错误数组未打印

Question

This is part of my login page, everything used to work I'm not sure if i changed something that caused an error. When printing the $_SESSION it says array but when i try to print $_SESSION['user'] like i saved the data in the code below it will not work???

require("includes/connection.php");
echo $_SESSION;
echo $_SESSION['user'];
echo ' ';
if(empty($_SESSION['user']))
{}

login page info, when i print the row is shows the array but when i change the page destination and try to print above the session is not printing anything.

unset($row['salt']);
unset($row['password']);
echo $row['username'];
$_SESSION['user'] = $row;

Answer 1

add this in first line;

ob_start();
session_start();

Answer 2

You need to use session_start(); at the top and $_SESSION is an array, you cant use echo , so you need to use print_r($_SESSION);