PHP-Geöffnet-Schild

---- Hauptseite -----------------------------------------
<?php $conf = unserialize(file_get_contents('_sign-conf.ser')); ?>  
<img src="<?php echo $conf['url'] ?>" alt="<?php echo $conf['desc'] ?>">  

---- Konfiguration --------------------------------------
<?php

	if (isset($_POST['send'])) {  
		$conf = array();
		switch ($_POST['open']) {  
			case '1':  
				$conf['url']  = 'open.jpg';  
				$conf['desc'] = 'Geöffnet';  
				break;
			
			case '0':  
				$conf['url']  = 'closed.jpg';  
				$conf['desc'] = 'Geschlossen';  
				break;
			
			default:
				trigger_error("Parameterfehler!", E_USER_ERROR);  
				break;
		}
		file_put_contents('_sign-conf.ser', serialize($conf));  
	}

?>
	<form action="" method="post">  
		<select name="open">  
			<option value="0">Nicht offen</option>  
			<option value="1">Offen</option>  
		</select>
		<input type="submit" name="send" value="Speichern" id="send" />  
	</form>

$open = 12; // Macht die Kneipe auf
$close = 18; // Schließt der Laden

if(date("G") >= $open && date("G") <= $close) {  
  echo '<img src="open.jpg" />';  
} else {
  echo '<img src="close.jpg" />';  
}