Drop experience on death

src/pocketmine/entity/Living.php

@@ -510,7 +510,9 @@ abstract class Living extends Entity implements Damageable{
 			$this->deadTicks += $tickDiff;
 			if($this->deadTicks >= $this->maxDeadTicks){
 				$this->endDeathAnimation();
-				//TODO: spawn experience orbs here
+
+				//TODO: check death conditions (must have been damaged by player < 5 seconds from death)
+				$this->level->dropExperience($this, $this->getXpDropAmount());
 			}
 		}
 
@@ -660,6 +662,14 @@ abstract class Living extends Entity implements Damageable{
 		return [];
 	}
 
+	/**
+	 * Returns the amount of XP this mob will drop on death.
+	 * @return int
+	 */
+	public function getXpDropAmount() : int{
+		return 0;
+	}
+
 	/**
 	 * @param int   $maxDistance
 	 * @param int   $maxLength

src/pocketmine/entity/Zombie.php

@@ -57,4 +57,9 @@ class Zombie extends Monster{
 
 		return $drops;
 	}
+
+	public function getXpDropAmount() : int{
+		//TODO: check for equipment and whether it's a baby
+		return 5;
+	}
 }