HTTP_REFERER undefined

[parka]

Hi all,

 

I'm trying to print a referral link  on my page, the code is as follows:

 

$refererSite = $_SERVER['HTTP_REFERER'];
if ($refererSite !== null){
print("<a href='$refererSite'>Back to $refererSite</a><br /><br />\n");
}

 

When I put it onto a page, it'll get the Undefined Index error. It does so if a user were to have the page listed as homepage and was not directed there from other pages.

 

What's the recommended way to getting around this?

 

Should I suppress the error by adding "@"?

 

[magnetica]

Are you trying this on a server you have set-up on your PC?

[parka]

Are you trying this on a server you have set-up on your PC?

 

Yup. The server is on my PC.

[magnetica]

Yea I tried doing the same thing on my local server

 

I think there is a setting in the php.ini that you have to change?!

 

Try it on your hosting service. See if it works there

[Yesideez]

Try this...

<?php
  $refererSite=$_SERVER['HTTP_REFERER'];
  if (!empty($refererSite)) {
   print("<a href='$refererSite'>Back to $refererSite</a><br /><br />\n");
  }

Note that if you enter the URL that script is stored on your PC directly and not linking to it from another page then the referer will be empty - I got caught out by that!

 

Oh, and as magnetica says

[parka]

Try this...

<?php
  $refererSite=$_SERVER['HTTP_REFERER'];
  if (!empty($refererSite)) {
    print("<a href='$refererSite'>Back to $refererSite</a><br /><br />\n");
  }

Note that if you enter the URL that script is stored on your PC directly and not linking to it from another page then the referer will be empty - I got caught out by that!

 

Oh, and as magnetica says

 

Thanks.

 

If it's empty, I can have a "else" print nothing, right?

[Yesideez]

This will work:

<?php
  $refererSite=$_SERVER['HTTP_REFERER'];
  if (!empty($refererSite)) {
    print("<a href='$refererSite'>Back to $refererSite</a><br /><br />\n");
  } else {}

But I don't know why you'd need an empty else.

[parka]

This will work:

<?php
  $refererSite=$_SERVER['HTTP_REFERER'];
  if (!empty($refererSite)) {
    print("<a href='$refererSite'>Back to $refererSite</a><br /><br />\n");
  } else {}

But I don't know why you'd need an empty else.

 

Good point. Just realised that.

 

Anyway, I still have the undefined index caused by $_SERVER['HTTP_REFERER'].

Should I just suppress it with "@".

Is it good programming practice?

[Yesideez]

You can supress it but it's not really good programming practise. Errors should really be trapped but I never bother as I do my best to avoid errors being generated as I've not yet got around to figuring out trapping *oh the shame of me*