This Gist an example code complying with the PocketMine-MP Contributing Syntax Standard.

PocketMine_Syntax_Example.php

<?php 

namespace DeveloperName\Example;

class ExampleClass{
	const EXAMPLE_CLASS_CONSTANT = 1;
	public $examplePublicVariable = "defaultValue";
	private $examplePrivateVariable;

	public function __construct($firstArgument, &$secondArgument = null){
		if($firstArgument === "exampleValue"){ //Remember to use === instead == when possible
			//do things
		}elseif($firstArgument === "otherValue"){
            		$secondArgument = function(){
		                return [
					0 => "value1",
		                    	1 => "value2",
		                    	2 => "value3",
		                    	3 => "value4",
		                    	4 => "value5",
		                    	5 => "value6",
		                ];
    			}
		}
    	}
}