PHP Class Zend\Stratigility\Middleware\ErrorHandler

Use this middleware as the outermost (or close to outermost) middleware layer, and use it to intercept PHP errors and exceptions. The class offers two extension points: - Error response generators. - Listeners. Error response generators are callables with the following signature:


function (
    Throwable|Exception $e,
    ServerRequestInterface $request,
    ResponseInterface $response
) : ResponseInterface

These are provided the error, and the request responsible; the response provided is the response prototype provided to the ErrorHandler instance itself, and can be used as the basis for returning an error response. An error response generator must be provided as a constructor argument; if not provided, an instance of Zend\Stratigility\Middleware\ErrorResponseGenerator will be used. Listeners use the following signature:


function (
    Throwable|Exception $e,
    ServerRequestInterface $request,
    ResponseInterface $response
) : void

Listeners are given the error, the request responsible, and the generated error response, and can then react to them. They are best suited for logging and monitoring purposes. Listeners are attached using the attachListener() method, and triggered in the order attached.

Inheritance: implements Interop\Http\Middleware\ServerMiddlewareInterface

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Public Methods

Method	Description
__construct ( Psr\Http\Message\ResponseInterface $responsePrototype, callable $responseGenerator = null )
__invoke ( Psr\Http\Message\ServerRequestInterface $request, Psr\Http\Message\ResponseInterface $response, callable $next ) : Psr\Http\Message\ResponseInterface	Proxy to process()
attachListener ( callable $listener )	Attach an error listener.
process ( Psr\Http\Message\ServerRequestInterface $request, Interop\Http\Middleware\DelegateInterface $delegate ) : Psr\Http\Message\ResponseInterface	Middleware to handle errors and exceptions in layers it wraps.

Private Methods

Method	Description
createErrorHandler ( ) : callable	Creates and returns a callable error handler that raises exceptions.
handleThrowable ( Throwabl\Throwable \| Exceptio\Exception $e, Psr\Http\Message\ServerRequestInterface $request ) : Psr\Http\Message\ResponseInterface	Handles all throwables/exceptions, generating and returning a response.
triggerListeners ( Throwabl\Throwable \| Exceptio\Exception $error, Psr\Http\Message\ServerRequestInterface $request, Psr\Http\Message\ResponseInterface $response ) : void	Trigger all error listeners.

Method Details

__construct() public method

public __construct ( Psr\Http\Message\ResponseInterface $responsePrototype, callable $responseGenerator = null )
$responsePrototype	Psr\Http\Message\ResponseInterface	Empty/prototype response to update and return when returning an error response.
$responseGenerator	callable	Callback that will generate the final error response; if none is provided, ErrorResponseGenerator is used.

__invoke() public method

Proxies to process, after first wrapping the $next argument using the CallableDelegateDecorator.

public __invoke ( Psr\Http\Message\ServerRequestInterface $request, Psr\Http\Message\ResponseInterface $response, callable $next ) : Psr\Http\Message\ResponseInterface
$request	Psr\Http\Message\ServerRequestInterface
$response	Psr\Http\Message\ResponseInterface
$next	callable
return	Psr\Http\Message\ResponseInterface

attachListener() public method

Each listener receives the following three arguments: - Throwable|Exception $error - ServerRequestInterface $request - ResponseInterface $response These instances are all immutable, and the return values of listeners are ignored; use listeners for reporting purposes only.

public attachListener ( callable $listener )
$listener	callable

process() public method

Adds an error handler that will convert PHP errors to ErrorException instances. Internally, wraps the call to $next() in a try/catch block, catching all PHP Throwables (PHP 7) and Exceptions (PHP 5.6 and earlier). When an exception is caught, an appropriate error response is created and returned instead; otherwise, the response returned by $next is used.

public process ( Psr\Http\Message\ServerRequestInterface $request, Interop\Http\Middleware\DelegateInterface $delegate ) : Psr\Http\Message\ResponseInterface
$request	Psr\Http\Message\ServerRequestInterface
$delegate	Interop\Http\Middleware\DelegateInterface
return	Psr\Http\Message\ResponseInterface