Method App\View\Cell\WhateverCell::__toString() must not throw an exception

[gtrias]

I'm having this error with WhoopsHandler, note that with default Cakephp 3 ErrorHandler I can see the trigger_error rised by Cell __toString() method. I'm not sure if the error is from the plugin or the Whoops library itself but I post here because is related with cakephp as well.

This error makes very hard to debug errors on Cell's templates.

To reproduce the error create a cell and on its display.ctp write the next:

<?php

$somearray = array('testing' => 'values');

// then try to echo 
echo $somearray;

Some useful information about this error:

http://stackoverflow.com/questions/2429642/why-its-impossible-to-throw-exception-from-tostring
http://www.phpsadness.com/sad/14

[jadb]

Interesting...

What's your PHP's error level? Could be related to that since Whoops I believe catches triggered errors, not just thrown exceptions.

[gtrias]

My PHP error level is 24575.

Which error level should I have?

[elboletaire]

It does not just occur with Cells. I'm having a similar issue with a custom AuthComponent (which also loads custom authenticators, password hashers and custom authorize classes).

Using the default CakePHP error handler shows all the stack and a clear error, whilst using this whoops plugin only shows a PHP7ErrorException:

[dereuromark]

@elboletaire Sounds also like Middleware is a different handler than the low level one.
https://github.com/dereuromark/cakephp-whoops should fix things for you.