Catching syntax error and custom error reporting - slim

Question

I am using slim framework 3 . I am new to this framework. I am working on catching the errors and returning the custom JSON error and message.
I used this code to catch notFoundHandler error :
$container['notFoundHandler'] = function ($c) {
return function ($request, $response) use ($c) {
return $c['response']
->withStatus(404)
->withHeader('Content-Type', 'application/json')
->write('Page not found');
};
};
But I am able to catch the normal syntax error.
It is showing Warning: fwrite() expects parameter 2 to be string, array given in X-api\controllers\Products.php on line 42
Instead of this message, I want my custom error to handle syntax error reporting.
I used this also,
$container['phpErrorHandler'] = function ($c) {
return function ($request, $response, $exception) use ($c) {
//Format of exception to return
$data = [
'message' => "hello"
];
return $container->get('response')->withStatus($response->getStatus())
->withHeader('Content-Type', 'application/json')
->write(json_encode($data));
};
};
But not working for me.

Answer 1

The default error handler can also include detailed error diagnostic information. To enable this you need to set the displayErrorDetails setting to true:
$configuration = [
'settings' => [
'displayErrorDetails' => true,
],
];
$c = new \Slim\Container($configuration);
$app = new \Slim\App($c);
Note this is not appropriate for production applications, since it may reveal some details you would want not to reveal. You can find more in Slim docs.
EDIT
If you need to handle parseErrors, then you need to define phpErrorHandler in your container, just like you did define notFoundHandler.
$container['phpErrorHandler'] = function ($container) {
return function ($request, $response, $error) use ($container) {
return $container['response']
->withStatus(500)
->withHeader('Content-Type', 'text/html')
->write('Something went wrong!');
};
};
Note: this will work with PHP7+ only, because in older versions parseErrors cannot be catched.

Answer 2

I have used this short of code in my dependencies.php
$container['errorHandler'] = function ($c) {
return function ($request, $response) use ($c) {
$data = [
'message' => "Syntex error"
];
return $c['response']
->withStatus(200)
->withHeader('Content-Type', 'application/json')
->write(json_encode($data));
};
};
set_error_handler(function ($severity, $message, $file, $line) {
if (!(error_reporting() & $severity)) {
// This error code is not included in error_reporting, so ignore it
return;
}
throw new \ErrorException($message, 0, $severity, $file, $line);
});
Now its working for me.