array getIndicesForChoices(array $choices) deprecated
deprecated
since version 2.4, to be removed in 3.0.
Returns the indices corresponding to the given choices.
The indices must be positive integers or strings accepted by {@link \Symfony\Component\Form\FormConfigBuilder::validateName()}.
The index "placeholder" is internally reserved.
The indices must be returned with the same keys and in the same order as the corresponding choices in the given array.
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