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PHP Abstract Classes

Mr. John Doe
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 {
  public function prefixName($name) {
    if ($name == "John Doe") {
      $prefix = "Mr.";
    } elseif ($name == "Jane Doe") {
      $prefix = "Mrs.";
    } else {
      $prefix = "";
    }
    return "{$prefix} {$name}";
  }
}

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