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Welcome to the SAM-join-messages wiki! Let me explain the code.

First here is the code:

<?php
namespace Hittmana\SAM;

use pocketmine\plugin\PluginBase;
use pocketmine\event\player\PlayerJoinEvent;
use pocketmine\Player;
use pocketmine\Server;
use pocketmine\event\Listener;

class MainClass extends PluginBase implements Listener{
    public function onEnable()
    {
        $this->getLogger()->info("[SAM] SAM v0.0.1 enabled");
        $this->getServer()->getPluginManager()->registerEvents($this, $this);
    }

    public function onDisable()
    {
        $this->getLogger()->info("[SAM] SAM v0.0.1 disabled");
    }

    function onJoin(PlayerJoinEvent $event)
    {
        $name = $event->getPlayer()->getDisplayName();    
        if ($registered = FALSE){
        //$registered is whether or not the player is registered. Set it to retrieve the players info from the $url
        $name->sendMessage("[SAM] Hello " . $name . " this server use SAM by Edwardthedog2. You must register at " .          $url . " to play");  
     //$url is the url of the users website
    }
    if ($registered = TRUE){
        //$registered is whether or not the player is registered. Set it to retrieve the players info from the $url
        $name->sendMessage("[SAM] Hello" . $name . " To play you must login with /login (your password)");  
       //$url is the url of the users website
    }
  }
}

Now lets go over what does what :).

First:

    public function onEnable()
    {
        $this->getLogger()->info("[SAM] SAM v0.0.1 enabled");
        $this->getServer()->getPluginManager()->registerEvents($this, $this);
    }

    public function onDisable()
    {
        $this->getLogger()->info("[SAM] SAM v0.0.1 disabled");
    }

This is just sending messages to the console on Enable and Disable. these can be changed safely.

Next:

if ($registered = FALSE){
            //$registered is whether or not the player is registered. Set it to retrieve the players info from the $url
            $name->sendMessage("[SAM] Hello " . $name . " this server use SAM by Edwardthedog2. You must register at " . $url . " to play");  
         //$url is the url of the users website
        }

Lets break down what some of the confusing variables ($) do!

$registered

Is whether or not the player is registered. You will have to use this var as a boolean and must figure out how to retrieve whether or not the user is registered from the website yourself as I don't know how you do this.

$url

Is the url of then website they must register at. This is just so the player knows where to register.

if ($registered = TRUE){
        //$registered is whether or not the player is registered. Set it to retrieve the players info from the $url
        $name->sendMessage("[SAM] Hello" . $name . " To play you must login with /login (your password)");  
        //$url is the url of the users website
    }

Is the message it sends if the player IS registered.

$name

Is the players DisplayName.