PHP Enum Solution

Enum.php

<?php

/**
 * This is a trick or solution for create enumerations in PHP using classes
 * If you are curious you will realize that you can build a hierarchy of 
 * enumerations, even give other uses to those classes.
 *
 * @author rafageist
 */

// Variant 1: Create a that simple abstract class (with or without namespace) ...
// ... I like namespaces

namespace Enums {
  
  abstract class Enum {
	  public function __toString() {
		  return get_class($this); // the name of the class is the value !!
	  }
  }

  // create enum as abstract class
  abstract class Temperature extends Enum {}
  
  // create the items as classes
  class HOT extends Temperature {}
  class COLD extends Temperature {}
}

// Variant 2: with traits 
/*
namespace Enums {
  
  trait Enum {
	  public function __toString() {
		  return get_class($this); // the name of the class is the value !!
	  }
  }

  // create your enum 
  abstract class Temperature {}
  
  // create the items of your enum
  class HOT extends Temperature { use Enum; }
  class COLD extends Temperature { use Enum; }
}
*/

test.php

<?php

include "Enums.php";

use Enums;

function doSome(Temperature $data){
	echo $data."\n";
	
	if ($data instanceof HOT) echo "is hot\n";
	if ($data instanceof COLD) echo "is cold\n";

	if ($data == 'HOT') echo "super hot \n";
	if ($data == 'COLD') echo "super cold \n";
	
	switch($data) {
		
		case 'HOT':
			echo "1 is case of hot\n";
		break;
		
		case 'COLD':
			echo "1 is case of cold\n";
		break;
	}
		
	
	switch($data) {
		
		case HOT::class:
			echo "2 is case of hot\n";
		break;
		
		case COLD::class:
			echo "2 is case of cold\n";
		break;
	}
	
	switch(true) {

		case $data instanceof HOT:
			echo "3 is case of hot !!\n";
		break;
		
		case $data instanceof COLD:
			echo "3 is case of cold !!\n";
		break;
	}
}

doSome(new HOT());
doSome(new COLD());