„PHP-Script” – Grafik ändert sich nach Tageszeit!

<?='<img src="http://www.meineseite.de/bilder/'.date("G",time()).'.png">'?>

$h = date('G', time());
if($h > 22 || $h < 5) {
  // nachts
}
elseif ($h > 16) {
  // abends
}
elseif ($h > 13) {
  // nachmittags
}
elseif ($h > 11) {
  // mittags
}
else {
  // morgens
} 

 <img src="script.php" alt="">

 
<?php
$img = imagecreatefromjpeg('bild.jpg');

header('Content-type: image/jpeg');
header('Content-disposition: inline; filename="bild.jpg"');
imagejpeg($img);
?> 

<?php

$img = "";
$name = "";

$h = date('G', time());
if($h > 22 || $h < 5) {
  // nachts
$img = imagecreatefromjpeg('nachts.jpg');
$name = "nachts.jpg";
}
elseif ($h > 16) {
  // abends
$img = imagecreatefromjpeg('abends.jpg');
$name = "abends.jpg";
}
elseif ($h > 13) {
  // nachmittags
$img = imagecreatefromjpeg('nachmittag.jpg');
$name = "nachmittag.jpg";
}
elseif ($h > 11) {
  // mittags
$img = imagecreatefromjpeg('mittag.jpg');
$name = "mittag.jpg";
}
else {
$img = imagecreatefromjpeg('morgen.jpg');
$name = "morgen.jpg";
} 
header('Content-type: image/jpeg');
header('Content-disposition: inline; filename="' . $name.'");
imagejpeg($img);
?>

http://domain.endung/img/avatar.png

1: AddType application/x-httpd-php .png