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Create an easy String using php function.

{ // deep_execution_view
const authorName = "Ankit Agrawal";
//
const publishDate = "March 16, 2017"; 
$new = array('a','b','c','d','e','f');
$comma_list = strrev(implode(strrev(' and'), explode(strrev(','), strrev(implode(', ', $new)), 2)));
echo 'The list is ' . $comma_list . '.';

output:
The list is a,b,c,d,e and f.

}