Need helps in array

Right now, the text shows the wrong letters; we want it to display my real favorite letters from the array. In the next few tasks, we’ll change that. This task has two steps. (1) Add the start of a foreach loop with an opening curly brace between the third and fourth echo commands. The foreach loop should load each element from the letters array, one at a time, into a working variable named letter. (2) Add the closing curly brace for the foreach loop between the fourth and fifth echo commands. (Leave the letters AB in the fourth echo command for now. At the end of this step, the page should say my favorite letters are ABABAB.) how will to do this two steps ?

<?php
$letters = array("D","G","L");


echo "My favorite ";
echo count($letters);
echo " letters are these: ";
echo $letters[0] . $letters[1] . $letters[2];
echo "AB";
foreach($letters as $loop){
  echo $loop;
}
echo ".";

?>