redirect if id is empty

[frank_solo]

I have a question I have page like so:

 

index.php?id=100

 

but let's say that id=101 is blank

 

Is there a way to redirect the user if that page is empty. Redirect them to homepage. Is this possible and how?

 

Thanks

[requinix]

As soon as you discover the thing is "empty", use a header to redirect (check the example). Make sure you do so before there has been output of any kind, including HTML and whitespace before your <?php tags.

[Q695]

you can do that or do an if (!$id) on the inside, then display one page, or the other with includes.

[frank_solo]

Well I've done this so far but this helps only if index.php?id=(blank)

if (!isset($_GET['id']) || empty($_GET['id'])) {
    header('location: http://www.mydomain.co') ;
}

What I would like as well is to query the table and check if the id exist if not to redirect. 

[requinix]

So do that.

[Q695]

Is it solved, or do we need to help you further?

[frank_solo]

This worked

<?php
session_start();
include 'config.php';
$url_id = mysql_real_escape_string($_GET['id']);
$sql = "SELECT id FROM places WHERE id='$url_id' AND unit='Residential' AND county='New Jersey'";
$result = mysql_query($sql);
if(mysql_num_rows($result) >0){
   //found
   $query="UPDATE `places` SET `views` = `views` + 1 WHERE `id` = $url_id";

}else{
   //not found
   header("location: http://www.mydomain.co");
}
?>

But now this won't work
$query="UPDATE `units` SET `views` = `views` + 1 WHERE `id` = $url_id";

Can someone show me how to make that statement work or should I start a different thread?

Thanks

[frank_solo]

Got it:
 

<?php
include "config.php";
$id = mysql_real_escape_string((int)$_GET['id']);
$sql = "SELECT id FROM places WHERE id='$id' AND unit='Residential' AND county='New Jersey'";
$result = mysql_query($sql);
if(mysql_num_rows($result) >0){
   //found
   
}else{
   //not found
   header("location: http://www.mydomian.co");
}
$query = "UPDATE `units` SET `views` = `views` + 1 WHERE `id` = $id";
$res = mysql_query($query, $bd);
$query = "SELECT * FROM `places` WHERE `id` = $id";
$res = mysql_query($query, $bd);
$result = mysql_fetch_assoc($res);
$lat = $result['lat'];
$contact = $result['contact'];
$phone = $result['phone']; 
$long = $result['lng'];
?>

[requinix]

header() does not immediately end your script - it will continue running. Use an exit; or die; after calling it.

//not found
header("location: http://www.mydomian.co");
exit;