PHP Functions - Returning values

PHP Functions - Returning values

<?php
function sum($x,$y) {
  $z=$x+$y;
  return $z;
}
 
echo "5 + 10 = " . sum(5,10) . "
";
echo "7 + 13 = " . sum(7,13) . "
";
echo "2 + 4 = " . sum(2,4);
?>