Syntax makes EA complain about a possible Fatal error when in fact the array is ok

[svenbergryen]

The following code causes EA to flag an Unsupported string offset operations error.

function uib_ui_form_alter(&$form): void {
  if ($form['#webform_id'] === 'feedback') {
    $result = 'blah';
  }
  $field = 'foo';
  $form[$field]['widget']['#default_value'] = $result;
}

It seems that line 2 in the snippet causes the reporting. If I remove that line, no error is shown.

Could provoke a PHP Fatal error (cannot use string offset as an array).

Subject	Details
Plugin	Php Inspections (EA Extended) or Php Inspections (EA Ultimate), which version
Language level	e.g. PHP 7.2 (check project settings or composer.json)

Current behaviour

The code causes an potential error to be flagged.

Expected behaviour

Environment details

Information from Help - About dialog

[ea-inspections-team]

Thank you for reporting @svenbergryen!

$form['#webform_id'] === 'feedback' tricks PhpStorm into thinking $form is string[]. As a result, $form[$field] is resolved as a string, triggering this inspection. I tried to find a workaround, but had no luck. Perhaps a detailed annotation of the array structure will help.