echoing two things in different if statements - php

Question

if ($_SERVER["REQUEST_METHOD"] == "POST")
{
$serv_id = $_POST['serv_id'];
$time = $_POST["time"];
$date = $_POST["date"];
if (!isset($_SESSION['id']))
{
echo "sorry you're not logged in.";
exit();
}
if(date('w', strtotime($date)) == 6 || date('w', strtotime($date)) == 0)
{
echo 'Event is on a weekend and cannot be booked.';
}
else
{
echo 'Thank for you booking with Claires hair and beauty';
$time = $time. ":00:00";
$result = mysqli_query($con, "SELECT time FROM tbl_booking WHERE time = '$time' AND date = '$date'") or trigger_error("Query Failed! SQL: $result - Error: ".mysqli_error($con), E_USER_ERROR);
}
if(mysqli_num_rows($result) == 0)
{
$sql = "INSERT INTO tbl_booking (tbl_mem_id, serv_id, date, time) VALUES ('{$_SESSION['id']}','$serv_id','$date','$time')";
mysqli_query($con, $sql) or die('Error: ' . mysqli_error($con));
location: 'dashboard.php';
}
else
{
echo("this time is already booked");
}
}
Essentially I'm trying to make it check if they're logged in by checking a session variable, then check if the date they have entered is a weekend and then if the date/time being entered is already taken as if it is it just needs to echo this time is already booked.
But what is happening is when the slot is already taken? It echos
Thank for you booking with Claires hair and beautythis time is already booked

Answer 1

Try This Code:
if(date('w', strtotime($date)) == 6 || date('w', strtotime($date)) == 0)
{
echo 'Event is on a weekend and cannot be booked.';
}
else
{
$time = $time. ":00:00";
$result = mysqli_query($con, "SELECT time FROM tbl_booking WHERE time = '$time' AND date = '$date'") or trigger_error("Query Failed! SQL: $result - Error: ".mysqli_error($con), E_USER_ERROR);
}
if(mysqli_num_rows($result) == 0)
{
$sql = "INSERT INTO tbl_booking (tbl_mem_id, serv_id, date, time) VALUES ('{$_SESSION['id']}','$serv_id','$date','$time')";
mysqli_query($con, $sql) or die('Error: ' . mysqli_error($con));
echo 'Thank for you booking with Claires hair and beauty';//this is right place
location: 'dashboard.php';// Don't know what you trying to do here
}
else
{
echo("this time is already booked");
}
If you want to redirect to another page in php use this:
header('Location: yourpage.php');
PHP Header Function