A PocketMine Plugin script which allows players to teleport across worlds

WorldShift.php

<?php
/**
 * @name WorldShift
 * @main jasonwynn10\WorldShift\MainClass
 * @version 0.1.0
 * @api 3.0.0-ALPHA5
 * @description A script to allow teleportation across worlds
 * @author jasonwynn10
 */

namespace jasonwynn10\WorldShift{
	use pocketmine\command\PluginCommand;
	use pocketmine\plugin\PluginBase;
	class MainClass extends PluginBase{
		public function onEnable() {
			$this->getServer()->getCommandMap()->register(WorldCommand::class, new WorldCommand($this));
			$this->getServer()->getCommandMap()->register(WorldsCommand::class, new WorldsCommand($this));
		}
		public function onCommand(CommandSender $sender, Command $command, $label, array $args) {
			if(strtolower($command) == "world") {
				if($sender instanceof Player) {
					if(count($args) >= 1) {
						if($this->getServer()->loadLevel($args[0])) {
							if(($l = $this->getServer()->getLevelByName($args[0])) != null and isset($args[1])) {
								if(($p = $this->getServer()->getPlayer($args[1])) instanceof Player) {
									if($p->hasPermission("world.".strtolower($args[0]))) {
										$p->teleport($l->getSpawnLocation());
										return true;
									}
								}else{
									$this->getLogger()->error("Player isn't a player");
									return true;
								}
							}elseif(($l = $this->getServer()->getLevelByName($args[0])) != null) {
								$sender->teleport($l->getSpawnLocation());
								return true;
							}
						}
						$this->getLogger()->error("Level isn't a level");
						return true;
					}else{
						return false;
					}
				}else{
					if(count($args) >= 2) {
						if($this->getServer()->loadLevel($args[0])) {
							if(($l = $this->getServer()->getLevelByName($args[0])) != null and isset($args[1])) {
								if(($p = $this->getServer()->getPlayer($args[1])) instanceof Player) {
									if($p->hasPermission("world.".strtolower($args[0]))) {
										$p->teleport($l->getSpawnLocation());
										return true;
									}
								}else{
									$this->getLogger()->error("Player isn't a player");
									return true;
								}
							}
						}
						$this->getLogger()->error("Level isn't a level");
						return true;
					}else{
						return false;
					}
				}
			}
		}
		if(strtolower($command) == "worlds") {
			$sender->sendMessage(TF::YELLOW."---+---Worlds---+---");
			foreach ($this->getServer()->getLevels() as $level) {
				$sender->sendMessage(TF::YELLOW.$level->getName());
			}
			return true;
		}
		return true;
	}
	class WorldCommand extends PluginCommand {
		public function __construct(MainClass $plugin) {
			parent::__construct("world",$plugin);
			$this->setPermission("world.cmd");
			$this->setAliases(["w"]);
			$this->setDescription("Teleports the player between worlds");
			$this->setUsage("/world <world> [player]");
		}
		public function execute(CommandSender $sender, $alias, array $args) {
			if($sender instanceof Player) {
				if(count($args) >= 1) {
					if($this->getPlugin()->getServer()->loadLevel($args[0])) {
						if(($l = $this->getPlugin()->getServer()->getLevelByName($args[0])) != null and isset($args[1])) {
							if(($p = $this->getPlugin()->getServer()->getPlayer($args[1])) instanceof Player) {
								if($p->hasPermission("world.".strtolower($args[0]))) {
									$p->teleport($l->getSpawnLocation());
									return true;
								}
							}else{
								$this->getPlugin()->getLogger()->error("Player isn't a player");
								return true;
							}
						}elseif(($l = $this->getPlugin()->getServer()->getLevelByName($args[0])) != null) {
							$sender->teleport($l->getSpawnLocation());
							return true;
						}
					}
					$this->getPlugin()->getLogger()->error("Level isn't a level");
					return true;
				}else{
					return false;
				}
			}else{
				if(count($args) >= 2) {
					if($this->getPlugin()->getServer()->loadLevel($args[0])) {
						if(($l = $this->getPlugin()->getServer()->getLevelByName($args[0])) != null and isset($args[1])) {
							if(($p = $this->getPlugin()->getServer()->getPlayer($args[1])) instanceof Player) {
								if($p->hasPermission("world.".strtolower($args[0]))) {
									$p->teleport($l->getSpawnLocation());
									return true;
								}
							}else{
								$this->getPlugin()->getLogger()->error("Player isn't a player");
								return true;
							}
						}
					}
					$this->getPlugin()->getLogger()->error("Level isn't a level");
					return true;
				}else{
					return false;
				}
			}
		}
	}
	class WorldsCommand extends PluginCommand {
		public function __construct(MainClass $plugin) {
			parent::__construct("worlds",$plugin);
			$this->setPermission("worlds.cmd");
			$this->setDescription("List all available worlds");
			$this->setUsage("/world <world> [player]");
		}
		public function execute(CommandSender $sender, $alias, array $args) {
			$sender->sendMessage(TF::YELLOW."---+---Worlds---+---");
			foreach ($this->getPlugin()->getServer()->getLevels() as $level) {
				$sender->sendMessage(TF::YELLOW.$level->getName());
			}
			return true;
		}
	}
}