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PHP Abstract Classes

Dear Mr. John Doe
Dear Mrs. Jane Doe

<?php
abstract class ParentClass {
  // Abstract method with an argument
  abstract protected function prefixName($name);
}

// class ChildClass extends ParentClass
class ChildClass extends ParentClass {

  // The child class may define optional arguments that is not in the parent's abstract method
  public function prefixName($name, $separator = ".", $greet = "Dear") {
    if ($name == "John Doe") {
      $prefix = "Mr";
    } elseif ($name == "Jane Doe") {
      $prefix = "Mrs";
    } else {
      $prefix = "";
    }
    return "{$greet} {$prefix}{$separator} {$name}";
  }
}

// display ChildClass data
$class = new ChildClass;
echo $class->prefixName("John Doe");
echo "<br>";  
echo $class->prefixName("Jane Doe");
?>