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Flash messages are self-expiring, session-based messages. They are typically used when when you need to redirect after processing a request (e.g., when using the Post-Redirect-Get pattern), but want to display a message back to the user indicating a processing result.
As an example, I may want to display a "Thank You" message to the user after successfully completing a form. I can do that with flash messages.
When processing, I would create the message in my middleware:
$flashMessages->flash('form-complete', 'Thank you; your submission was recorded.');
On the subsequent request, my middleware would pull that message:
$message = $flashMessages->getFlash('form-complete');
On any subsequent requests, the message is no longer available!
To use the component, install via Composer:
$ composer require zendframework/zend-expressive-flash
zend-expressive-flash depends on zend-expressive-session, which defines abstractions around session containers — for use within applications for accessing session data — and session persistence (how the session data is persisted between requests, and reported to the client).
Persistence requires a persistence adapter. We offer one basd on PHP's session extension via the package zend-expressive-session-ext; others may also be available soon.
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