How to use 'choice_name' in symfony?

@elise_daugherty 

In Symfony, 'choice_name' is used in forms to define how the choices in a choice field should be displayed to the user.

You can use the 'choice_name' option in a ChoiceType field in your form builder like this:

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$builder->add('colors', ChoiceType::class, [
    'choices' => [
        'Red' => 'red',
        'Blue' => 'blue',
        'Green' => 'green',
    ],
    'choice_name' => function ($value, $key, $index) {
        // You can customize how the choices should be displayed here
        return $value . ' - ' . $key;
    },
]);

In the example above, the 'choice_name' option is used to modify the display of the choices in the 'colors' field. You can customize the display by providing a callback function that takes the value, key, and index of each choice as arguments and returns a formatted string.

This allows you to display the choices in a more user-friendly way by adding additional information or formatting the choices as needed.