选项文本重复时，将覆盖Symfony2选项选项

Question

Currently I am working on building a select box for phone country extensions. My select box is like this.

<option value="Albania">355</option>
...

<option value="Canada">1</option>
...

I provide an array as choices for the select field in the Symfony form. array is like this.

array(
'Albania' => 355,
'Afganisthan' => 93,
...
'Canada' => 1,
...
...
'United States Of America' => 1
);

But, when I render the form, the list rendered is bit strange. I cannot see Canada option. Instead, it is replaced by United States Of America.

I guess it is because of the option text is the same (1 and 1).

This was working before until I upgrade my Symfony version from 2.4 to 2.7. I went through the Symfony documentation but not enough lucky to find any related thing.

Why this happens?

Answer 1

I found a workaround for this. Cannot say it is a perfect solution.

I added the choice_as_values as true to my field. And added the choice_value callback. Helped (this)[https://github.com/symfony/symfony/issues/14377#issuecomment-107872604] advise. It helped me to make it not flipped.