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Up until now when there's been an error,

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we just redirect the user back to
a form or page that they were just on.

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But we do not provide any information.

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I think we should fix this and
show some sort of message.

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When a message is only visible for

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a single request,
this is called a flash message.

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The Symfony HttpFoundation
package that we've been using

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gives us a nice set of
features to do this.

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We'll be using Sessions for this, and
attaching a message to its flashBag,

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the storage area for all these messages.

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The messages that are stored
here are automatically deleted

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when you retrieve them
to display on the site.

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The first thing we need to do

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is open our Bootstrap file and

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begin a session for our application.

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This will create a new session object and
start it.

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This is essentially the same
thing as doing session_start.

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That gives us a lot more
features to work with.

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To show how this works,
let's take a look at our login system.

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Open the do login procedure and
let's add some items to our session.

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If a user's email is not found, we should
let them know that the username was not

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found when we send them
back to the login page.

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We need to add a line to this check for
the empty username.

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From the session object in the Bootstrap
file, we get the FlashBag and

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can add to it.

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The first item is the key we want to use,
in this case, error.

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And the second is the message,
Username was not found.

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Internally, it will create an error array

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with all the messages
that belong to that key.

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To display the message, we need to check
for anything in the error FlashBag.

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I think this calls for
a nice helper function.

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We'll call this display_errors.

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And first we'll need to get
the global session variable.

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After that,

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we check to see

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if the FlashBag

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has an error.

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If not, we can return.

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If so,

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we need to get

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the errors.

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Now we can create an alert
with all the error messages.

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Let's loop over

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our messages.

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And finally, return the response.

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Now we need to display
errors on our login page.

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Let's take a look at this in the browser.

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If any errors exist,
they will now show here.

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We can expand this to show success
messages and other kinds of messages.

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Why don't you give it a shot and
add the function to display success and

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add these messages where
you find appropriate?

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Check the notes associated with
this video for style examples.