note 118307 added to ref.network

This little function might come in handy <?php function cidr_range( $cidr, $chkip=null ) { // Assign IP / mask list($ip,$mask) = explode("/",$cidr); // Sanitize IP $ip1 = preg_replace( '_(\d+\.\d+\.\d+\.\d+).*$_', '$1', "$ip.0.0.0" ); // Calculate range $ip2 = long2ip( ip2long( $ip1 ) - 1 + ( 1 << ( 32 - $mask) ) ); // are we cidr range cheking? if ( $chkip != null && ! filter_var( $chkip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) === false ) { return ip2long( $ip1 ) <= ip2long( $chkip ) && ip2long( $ip2 ) >= ip2long( $chkip ) ? true : false; } else { return "$ip1 - $ip2"; } } var_dump( cidr_range( "127.0/16", "127.0.0.1" ) ); // bool(true) var_dump( cidr_range( "127.0/16", "192.168.0.1" ) ); // bool(false) var_dump( cidr_range( "192.168.0.0/24" ) ); // string(27) "192.168.0.0 - 192.168.0.255" ?> ---- Server IP: 72.52.91.14 Probable Submitter: 78.42.144.177 ---- Manual Page -- http://php.net/manual/en/ref.network.php Edit -- https://master.php.net/note/edit/118307 Del: integrated -- https://master.php.net/note/delete/118307/integrated Del: useless -- https://master.php.net/note/delete/118307/useless Del: bad code -- https://master.php.net/note/delete/118307/bad+code Del: spam -- https://master.php.net/note/delete/118307/spam Del: non-english -- https://master.php.net/note/delete/118307/non-english Del: in docs -- https://master.php.net/note/delete/118307/in+docs Del: other reasons-- https://master.php.net/note/delete/118307 Reject -- https://master.php.net/note/reject/118307 Search -- https://master.php.net/manage/user-notes.php