EnumTrait: add a numeric runtimeID field for arrays and switches

src/utils/EnumTrait.php

@@ -23,6 +23,7 @@ declare(strict_types=1);
 
 namespace pocketmine\utils;
 
+use function getmypid;
 use function preg_match;
 
 trait EnumTrait{
@@ -85,8 +86,13 @@ trait EnumTrait{
 		return self::_registryFromString($name);
 	}
 
+	/** @var int|null */
+	private static $nextId = null;
+
 	/** @var string */
 	private $enumName;
+	/** @var int */
+	private $runtimeId;
 
 	/**
 	 * @param string $enumName
@@ -98,6 +104,10 @@ trait EnumTrait{
 			throw new \InvalidArgumentException("Invalid enum member name \"$enumName\", should only contain letters, numbers and underscores, and must not start with a number");
 		}
 		$this->enumName = $enumName;
+		if(self::$nextId === null){
+			self::$nextId = getmypid(); //this provides enough base entropy to prevent hardcoding
+		}
+		$this->runtimeId = self::$nextId++;
 	}
 
 	/**
@@ -107,6 +117,17 @@ trait EnumTrait{
 		return $this->enumName;
 	}
 
+	/**
+	 * Returns a runtime-only identifier for this enum member. This will be different with each run, so don't try to
+	 * hardcode it.
+	 * This can be useful for switches or array indexing.
+	 *
+	 * @return int
+	 */
+	public function id() : int{
+		return $this->runtimeId;
+	}
+
 	/**
 	 * Returns whether the two objects are equivalent.
 	 *