Having problem using a code in CFV6

Hello
I have to get a full detail from a dynamic array to be displayed in an email but I am not able to do it. I have no problem working in CFV5 but it CFV6 it does not work.

<?php
require_once( JPATH_ROOT . DS . 'components' . DS . 'com_xyz' . DS . 'country_full_name.php' );
echo( "\n   {$country_full_name[$this->data['country_name'].''.'']}" );
?>

I get the name of country in two digits from a form field. For example AU. So as per this I get from a dynamic array the full name of the country that is Australia. in CSV5. I tried to do this in CFV6 by using a custom code but I just cannot get it to work.
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Could I get some help as to how could I accomplish this.
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Thanks
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Ron

Thanks for the response . I am going to try out.

Thanks healyhatman,
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Sorry I had not noticed the round brackets earlier. It worked
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Thanks again
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Ron

Hello healyhatman,
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I made the changes but the round brackets dose not seem to work. I get an empty response ( blank ).
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Thanks for all the help.
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Ron

Where is $country_full_name coming from and is this in a custom code block or a PHP block

It comes from the array that has the full names . It is a custom code block

country_full_name.php