1

According to the CakePHP 4 docs

// If you want a json response
$response = $response->withType('application/json')
->withStringBody(json_encode(['Foo' => 'bar']));

If you run phpstan on level 7 it will give this error

Parameter #1 $string of method Cake\Http\Response::withStringBody() expects string|null, string|false given.

json_encode is a core PHP function which has return types string|false so can't be modified.

withStringBody() is a CakePHP core method which accepts string|null.

How can you get around that error since neither of those 2 things can be modified directly?

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  • 2
    You could try casting the result of the function call to string (string)json_encode() Commented Aug 14, 2024 at 9:34
  • 2
    Do the json_encode first, on an earlier line, and if it returns false, don't pass it to withStringBody. If it does return false it indicates a problem with the encoding so I'd have thought you'd want to detect that and log an error and so on anyway. You can also set json-throw-on-error to make it automatically throw an exception when it fails, rather than having to detect it. Commented Aug 14, 2024 at 11:10
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