getting ip in a querry

[tito]

is it possible to pass machine ip in a querry? I get an error message with
mysql_query('SELECT username FROM sessions where ip=$_SERVER['REMOTE_ADDR']') or die(mysql_error());

[Kudose]

<?
if (getenv("HTTP_X_FORWARDED_FOR")) { 
    $ip = getenv("HTTP_X_FORWARDED_FOR"); 
} else { 
    $ip = getenv("REMOTE_ADDR"); 
} 
mysql_query("SELECT username FROM sessions WHERE ip='$ip'") or die(mysql_error());
?>

[tito]

thank you sir