checkmaid.php

<?php
    session_start();
    if(!$_SESSION['userid']){
        session_destroy();
        header('Location: index.php');
        exit;
    }
    if($_GET['check']){
        include('dbconnect.php');
        $id = $dbc->real_escape_string($_GET['check']);
        $checkmaid = $dbc->query("select concat(nachname, ', ', vorname) as name from mitarbeiter where maID = '$id';");
        $result = $checkmaid->fetch_assoc();
        if($result){
            echo "0schon belegt: $result[name]";
        }else{
            echo "1frei!";
        }
    }else{
        echo "0keine ID eingegeben!";
    }
?>