Why isn't $_SERVER['HTTP_REFERER'] not working in functions

[hos2]

I try to log certain input atempts.

when I use

$ua=$HTTP_SERVER_VARS['HTTP_USER_AGENT'];
$qs=$_SERVER['QUERY_STRING'];
$ref=$_SERVER['HTTP_REFERER'];
$query="INSERT INTO SYSLOGTABLE(SLIP,SLHOST,SLDATE,SLUA,SLREFERER) 
VALUES('$host','$ip','$datum','$ua','$ref')";

it works fine
but when I define a function around it, then the $ua,$ref,$qs are empty in the database ????

function test($conn){
$ua=$HTTP_SERVER_VARS['HTTP_USER_AGENT'];
$qs=$_SERVER['QUERY_STRING'];
$ref=$_SERVER['HTTP_REFERER'];
$query="INSERT INTO SYSLOGTABLE(SLIP,SLHOST,SLDATE,SLUA,SLREFERER) 
VALUES('$host','$ip','$datum','$ua','$ref')";
}

I tried to define them global but that also didn't work

 

[sleipnir214]

$ua will be empty because $HTTP_SERVER_VARS is only a global array. It's not available inside a function unless you use the global operator on it.

$_SERVER is superglobal and by definition available everywhere.

$ref could be blank simply because the browser isn't reporting referer logging. If the browser doesn't provide that information, it's simply not available.

Your query string building code doesn't reference $qs

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[ingresman]

Some client firewalls also prevent things like HTTP_REFERER being sent