Hoe schrijf ik een goede class?

<?

class example 
{
	function simpletime($intValue) 
	{
		$this = array();
		$this = $intValue;
		$this = date("j-n-Y", $this[0]); 
		$this = date("H:i", $this[0]);
		
		return $this;			
	}
}

$do = new example;
$do->simpletime(time());
echo $do[1] . $do[2];

?>

<?
 
class example 
{
	function simpletime($intValue) 
	{
		$this = array();
		$this = $intValue;
		$this = date("j-n-Y", $this[0]); 
		$this = date("H:i", $this[0]);
 
		return $this;			
	}
}
 
$do = new example;
$do->simpletime(time());
echo $do[1] . $do[2];
 
?>

<?

class example 
{
    function simpletime($intValue) 
    {
        $this = array();
        $this[] = $intValue;
        $this[] = date("j-n-Y", $this[0]); 
        $this[] = date("H:i", $this[0]);
        
        return $this;            
    }
}

$do = new example;
$do->simpletime(time());
echo $do[1] . $do[2];

?>

<?
 
class example 
{
    function simpletime($intValue) 
    {
        $this = array();
        $this[] = $intValue;
        $this[] = date("j-n-Y", $this[0]); 
        $this[] = date("H:i", $this[0]);
 
        return $this;            
    }
}
 
$do = new example;
$do->simpletime(time());
echo $do[1] . $do[2];
 
?>

<?php

class Example {

    private $timeArray;

    public function __construct($time) {
        
        $this->timeArray   = array();
        
        $this->timeArray[] = $time;
        $this->timeArray[] = date("j-n-Y", $time);
        $this->timeArray[] = date("H:i", $time);
    }

    public function printTime($position) {
        return isset($this->timeArray[$position]) ? $this->timeArray[$position] : $this->timeArray[0];
    }

}

$oExample = New Example(time());
$oExample->printTime(1) . ' - ' . $oExample->printTime(2);

<?php
 
class Example {
 
    private $timeArray;
 
    public function __construct($time) {
 
        $this->timeArray   = array();
 
        $this->timeArray[] = $time;
        $this->timeArray[] = date("j-n-Y", $time);
        $this->timeArray[] = date("H:i", $time);
    }
 
    public function printTime($position) {
        return isset($this->timeArray[$position]) ? $this->timeArray[$position] : $this->timeArray[0];
    }
 
}
 
$oExample = New Example(time());
$oExample->printTime(1) . ' - ' . $oExample->printTime(2);