Added a ClosureTask implementation for easier task scheduling (#2497)

src/pocketmine/utils/Utils.php

@@ -52,6 +52,19 @@ class Utils{
 		}
 	}
 
+	/**
+	 * Returns a readable identifier for the given Closure, including file and line.
+	 *
+	 * @param \Closure $closure
+	 *
+	 * @return string
+	 * @throws \ReflectionException
+	 */
+	public static function getNiceClosureName(\Closure $closure) : string{
+		$func = new \ReflectionFunction($closure);
+		return "closure@" . self::cleanPath($func->getFileName()) . "#L" . $func->getStartLine();
+	}
+
 	/**
 	 * Returns a readable identifier for the class of the given object. Sanitizes class names for anonymous classes.
 	 *