$userip

 = 

getenv

('REMOTE_ADDR'); 

} 

elseif

(isset(

$_SERVER

['REMOTE_ADDR']) && 

$_SERVER

['REMOTE_ADDR'] && 

strcasecmp

(

$_SERVER

['REMOTE_ADDR'], 'unknown')) { 

$userip

 = 

$_SERVER

['REMOTE_ADDR']; 

} 

$ban_range_low

=

ip2long

("217.0.0.0"); 

//ip 段上 

$ban_range_up

=

ip2long

("217.255.255.255");

//ip 段尾 

$ip

=

ip2long

(

$userip

]); 

if

 (

$ip

>

$ban_range_low

 && 

$ip

<

$ban_range_up

) 

{ 

print

 "Banned"; 

exit

(); 

} 
?>