public FormStateInterface::prepareCallback($callback)
Converts support notations for a form callback to a valid callable.
Specifically, supports methods on the form/callback object as strings when they start with ::, for example "::submitForm()".
string|array $callback: The callback.
array|string A valid callable.
public function prepareCallback($callback);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormStateInterface.php/function/FormStateInterface::prepareCallback/8.1.x