Undefined index: HTTP_REFERER in /var/www/file.php

[BigResource]

Help me once more and I am done with my error log. The error is:

Undefined index: HTTP_REFERER in /var/www/file.php

============ PHP CODE===============
//get referer log
if (!preg_match("/Mediapartners-Google/", $_SERVER['HTTP_USER_AGENT'])) {
get_logs($_SERVER['HTTP_REFERER'], $_SERVER['REQUEST_URI'], $_SERVER['HTTP_USER_AGENT'], $_SERVER['REMOTE_ADDR']);
}
===================================

TIA.

[Ernie1]

Not all user agents will set this, it cannot really be trusted.

[BigResource]

The question is not the User Agent. The question is PHP Notice: Undefined Index? What is meant by this?

Thanks.

[Sillysoft]

The question is not the User Agent. The question is PHP Notice: Undefined Index? What is meant by this?

Thanks.

It means there is an empty value for HTTP_REFERER. Not all browsers pass the referer. Notice message is not an error, its just a notice. If you dont want to see notices you can turn that off in your php.ini file.

[logic_earth]

It means there is an empty value for HTTP_REFERER..

It means the array key "HTTP_REFERER" is not set with in the array.

[Sillysoft]

It means the array key "HTTP_REFERER" is not set with in the array.

Now come on, dont get technical with me in a php forum

[BigResource]

Ok, now understand. I really appreciate if you can help with some alternative piece of code? I really need to log referer from Google only. Building sort of keyword list Google sending to me.

Again thanks for any help you can offer me.

[galen]

Here's a very simple version of what you're asking for

if (stripos($_SERVER['HTTP_REFERER'], 'www.google.com')) {
    parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $qry);
    echo $qry['q'];
} 

[joebert]

What happens if you place this above "//get referer log" ?

if( empty( $_SERVER['HTTP_REFERER']))
{
    $_SERVER['HTTP_REFERER'] = getenv('HTTP_REFERER');
}