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<?php //Используется так: function net_match ( $network , $ip ) { $ip_arr = explode ( '/' , $network ); $network_long = ip2long ( $ip_arr [ 0 ]); $x = ip2long ( $ip_arr [ 1 ]); $mask = long2ip ( $x ) == $ip_arr [ 1 ] ? $x : 2^( 32 - $ip_arr [ 1 ]); $ip_long = ip2long ( $ip ); echo ">".$ip_arr[1]."> ".decbin($mask)."\n"; return ( $ip_long & $mask ) == ( $network_long & $mask ); } echo net_match ( '192.168.0.0/2', '192.168.0.15' );

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