PHP - 如果没有结果，重定向到其他页面

Question

I would like to redirect the user to other page if there are no results.

what I meant like is, I am passing variables via url and using on the second page and if the the variables are empty I am able to redirect to another page.

However when the user changes the variable id in the url to something like

index.php?product-tit/=how+to+deal+with%20&%20item-id-pr=15

to index.php?product-tit/=how+to+%20&%20item-id-pr=

Nothing is displayed on the page so is there any way that I can redirect to other page in the above condition?

$title = urldecode($_GET['product-tit/']);
$id = $_GET['item-id-pr'];
$mydb = new mysqli('localhost', 'root', '', 'database');

if(empty($title) && empty($_GET['item-id-pr'])){
header('Location: products.php');
}
else{
$stmt = $mydb->prepare("SELECT * FROM products where title = ? AND id = ? limit 1 ");
$stmt->bind_param('ss', $title, $id);
$stmt->execute();
?> 
<div>
<?php
$result = $stmt->get_result();
 while ($row = $result->fetch_assoc()) {
echo wordwrap($row['price'], 15, "<br />
", true); 
}
$mydb->close ();}
?>
</div>

Answer 1

Your condition requires both variables to be empty, if you want to redirect when any is empty you should use an OR (||):

if(empty($title) || empty($_GET['item-id-pr'])){
  header('Location: products.php');
  // make sure nothing more gets executed
  exit();
}

Also note that you cannot output anything to the browser before a header statement.