Código PHP:
#============= Sample Code ===============
sub check_url
{
my @referers = ( "www.2checkout.com", "2checkout.com", "www2.2checkout.com" );
my $check_referer = 0;
if ( $ENV{HTTP_REFERER} )
{
foreach my $referer( @referers )
{
if ( $ENV{HTTP_REFERRER} =~ m|https?:://([^/]*)$referer|i )
{
$check_referer = 1;
}
}
}
else
{
$check_referer = 1;
}
if ( $check_referer != 1 )
{
...
"Insert Code to execute when the check fails";
...
}
}
#================ End Sample ==============