class BaseEnrollment
{
  method1();
  method2();
}


class Enrollment1 extends BaseEnrollment
{
  ...methods unique to enrollment type 1...
}


class Enrollment2 extends BaseEnrollment
{
  ...methods unique to enrollment type 2...
}


class Academics1 extends Enrollment1
{
  ... should inherit method1, method2, and anything specific to Enrollment1...
}


class Academics2 extends Enrollment2
{
  ... should inherit method1, method2, and anything specific to Enrollment2...
}

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<?php
trait StuffYouCanDoWithMostAnimals
{
    function pet()
    {
      return "The " . __CLASS__ . ", " . $this->name . ", likes it when you pet them!";
    }
    function lick()
    {
      return "The " . __CLASS__ . ", " . $this->name . ", tastes funny but it doesn't bite you back. Probably not the smartest decision you've ever made.";
    }
}

class Animal
{
  public $name = "an animal";
}

class DangerousAnimal extends Animal
{
  public $name = "a dangerous animal"; // Overrides the base Animal $name

  // Some methods that simply HAPPEN to use the same names as the ones in the trait, 
  // but they're not necessarily required. If you left off pet() and then you tried
  // to pet() one of these, then it would throw an error.
  function pet() 
  {
    return $this->diefrom("pet");
  }
  function lick()
  {
    return $this->diefrom("lick");
  }
  function diefrom($action)
  {
    return "The " . __CLASS__ . ", " . $this->name . ", kills you for daring to " . $action . " it.";
  }
}

class ApatheticAnimal extends Animal
{
  public $name = "an apathetic animal"; // Overrides the base Animal $name

  use StuffYouCanDoWithMostAnimals;

  function lick() // Override the lick() function from the trait
  {
    return "The " . __CLASS__ . ", " . $this->name . ", looks at you strangely, but it doesn't bite you back.";
  }


}

class FriendlyAnimal extends Animal
{
  public $name = "a friendly animal"; // Overrides the base Animal $name

  use StuffYouCanDoWithMostAnimals;
}

class Dog extends FriendlyAnimal
{
  public $name = "a dog"; // Overrides the FriendlyAnimal $name
}

class Bear extends DangerousAnimal
{
  public $name = "a bear"; // Overrides the DangerousAnimal $name
}

class Sloth extends ApatheticAnimal
{
  public $name = "a sloth"; // Overrides the ApatheticAnimal $name
}


$dog = new Dog();
echo $dog->pet() . "<br />\n";
echo $dog->lick() . "<br />\n";

$bear = new Bear();
echo $bear->pet() . "<br />\n";
echo $bear->lick() . "<br />\n";

$sloth = new Sloth();
echo $sloth->pet() . "<br />\n";
echo $sloth->lick() . "<br />\n";

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The FriendlyAnimal, a dog, likes it when you pet them!

The FriendlyAnimal, a dog, tastes funny but it doesn't bite you back.

The DangerousAnimal, a bear, kills you for daring to pet it.

The DangerousAnimal, a bear, kills you for daring to lick it.

The ApatheticAnimal, a sloth, likes it when you pet them!

The ApatheticAnimal, a sloth, looks at you strangely, but it doesn't bite you back.

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class Enrollment1 extends sqlTable
class Enrollment2 extends sqlTable
clasa Academics1 extends Enrollment1
class Academics2 extends Enrollment2

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class Academics extends Enrollment1
{
...
}

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class Academics extends Enrollment2
{
...
}

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trait MyTrait1
{
  public $myTrait1Props = array("foo" => "bar");
  public function getFoo() { return $this->myTrait1Props["foo"]; }
  public function setFoo($value) { $this->myTrait1Props["foo"] = $value; }
}


trait MyTrait2
{
  public $myTrait2Props = array("hello" => "world");
  public function getHello() { return $this->myTrait2Props["hello"]; }
  public function setHello($value) { $this->myTrait2Props["hello"] = $value; }
}




class Blah
{
  public $aBlahField = "apple";

  use MyTrait1;
  use MyTrait2;
}


$blah = new Blah();
echo $blah->aBlahField; // "apple"
echo $blah->getFoo(); // "bar"
echo $blah->getHello (); // "world "

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trait Academics {
  public static function sumXferCredits() {
  }

  public static function sumNonXferCredits { 
  }

  public static function sumTotalCredits { 
  }
}

class Enrollment1 extends sqlTable {

   use Academics;

   $attributes
   …
   public function method1() {
   }
   public function method2() {
   }
   …
}

class Enrollment12 extends sqlTable {

   use Academics;

   $attributes
   …
   public function method1() {
   }
   public function method2() {
   }
   …
}

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