Real time alerts when people visit your site with PHP

Basically when someone finds your site from another site it emails you and tells you where they came from. I know stats software is much more powerful but this is quite nice as it’s in real time.

if( !empty( $_SERVER[ "HTTP_REFERER" ] ) && substr_count( $_SERVER[ "HTTP_REFERER" ], “www.yourdomain” ) == 0 ) {

    $subject = “Someone has found YOUR WEBSITE NAME HERE”;  more...