Laravel 5.7会话无法正常工作的原因排查求助

Hey there, I spot the exact issue causing your session problems—you're using the wrong syntax to store data in the session! Let me break this down for you:

The Core Problem #

When you use the session() helper to store data, passing an indexed array (like session(['test', 'Some Value'])) doesn't work the way you think it does. Instead of setting a key-value pair where test is the key, this actually sets the session's index 0 to 'test' and index 1 to 'Some Value'.

Each subsequent session() call with an indexed array overwrites those same index keys (0 and 1), which is why only your last entry (test3) shows up in the session file. And when you try to retrieve session('test'), Laravel looks for a session key named test—which never got set in the first place, hence it returns your backup value.

The Fix #

Switch to using associative arrays (key-value pairs) when storing data with the session() helper. Here's how your controller code should look:

// Correct syntax for setting session values
session(['test' => 'Some Value']);
session(['test2' => 'Some Other Value']);
session(['test3' => 'Some Third Value']);

$value = session('test', 'Backup Value');
echo $value; // This will now output 'Some Value'

Alternatively, you can use the Session facade if you prefer (just make sure you've imported it at the top of your controller with use Illuminate\Support\Facades\Session;):

Session::put('test', 'Some Value');
Session::put('test2', 'Some Other Value');
Session::put('test3', 'Some Third Value');

Why This Works #

With associative arrays, you're explicitly defining the session key and its corresponding value. Laravel will store each of these as separate entries in the session, so none of them get overwritten by subsequent calls. When you check your session file after making this change, you'll see entries for test, test2, and test3 instead of just the indexed keys.

Quick Notes #

• The Laravel auth system isn't related to this issue—you don't need it for basic session functionality.
• Your earlier steps (clearing config/routes, switching to database sessions) were good troubleshooting moves, but they couldn't fix the syntax error at the core of the problem.

内容的提问来源于stack exchange，提问作者HartleySan