Start experiment to query Tagebuch entries

single.php

@@ -88,6 +88,15 @@
 								}
 							</script>
 						</div>
+
+						<?php
+							$tagebuch = get_posts(array(
+								'category_name' => 'Tagebuch',
+								'meta_key' => 'urlaub', // name of custom field
+								'meta_value' => '"' . get_the_ID() . '"', // matches exaclty "123", not just 123. This prevents a match for "1234"
+							));
+							var_dump($tagebuch);
+						?>
 					<?php endif; ?>
 
 				    <?php