Library (database version)

Displaying id ',intval(filter_input(INPUT_GET, "bookid", FILTER_VALIDATE_INT)),' :'; $SelectString = 'SELECT * FROM farlelibraryNew WHERE id='.$_GET["bookid"]; $Ergebnis=mysqli_query($mysqli,$SelectString); $db_output=mysqli_fetch_assoc($Ergebnis); if($db_output) { echo ''; echo ''; echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; } else { echo 'Entliehen'; echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; echo ''; } echo ''; echo ''; echo '',''; echo ''; echo ''; echo '',''; echo ''; echo ''; echo ''; echo ''; echo ''; echo '
ParameterValue'; echo '
'; echo '
'; echo '
Author',$db_output["author"],'
Title',$db_output["title"],'
Publishing company',$db_output["publisher"],'
Year',$db_output["year"],'
ISBN',$db_output["isbn"],'
Primo-Code',$db_output["happcode"],'
Category',$db_output["category"],'
Keywords',$db_output["keyword"],'
Property',$db_output["property"],'
Status'; if(strlen($db_output["lender"])==0 && strlen($db_output["lender_contact"])==0 ) { echo 'Entleihbar'; echo '
Lender',$db_output["lender"],'
Lending date',$db_output["lending_date"],'
Location',$db_output["location"],'
Last change',$db_output["change_date"],' by IP ',$db_output["change_ip"],'
Timestamp',$db_output["timestamp"],'
'; echo '

'; echo '
'; echo '
(conditional function!)
'; } else echo 'Database not existing!'; } else echo '

Database issue!
Please try again later!

'; mysqli_close($mysqli); } else echo 'Parameter error !'; ?>