php一句话webshell，留言系统 php 防攻击,php 留言板防刷新

php 留言板防刷新效果      $ip = $_SERVER['REMOTE_ADDR'];

$conn = mysql_connect($mysql_server_name, $mysql_username, $mysql_password);

php一句话webshell。$sql = "SELECT * FROM `my_counter` WHERE ip = '$ip'";

mysql_select_db($mysql_database, $conn);

$result = mysql_query($sql);

php实现留言板，$row = mysql_fetch_row($result);

print_r($row);

if(!$row)   //如果IP没有出现过就新增

空间留言最暖心的话？{

$sql = "INSERT INTO `my_counter` ( `new`, `ip`, `time_at`) VALUES ('1', '$ip', NOW())";

$result = mysql_query($sql);

php防注入。}

else        //如果IP出现过

{

友谊留言？$sql = "SELECT TIME_TO_SEC( NOW( ) ) - TIME_TO_SEC( time_at ) FROM `my_counter` WHERE `ip` = '$ip'ORDER BY `TIME_TO_SEC( NOW( ) ) - TIME_TO_SEC( time_at )` ASC ";

$result = mysql_query($sql);

$row = mysql_fetch_row($result);

留言情话、print_r($row);

if($row[0]>5)   //如果IP出现过，则看他有没有超过5秒

{

$sql = "INSERT INTO `my_counter` ( `new`, `ip`, `time_at`) VALUES ('1', '$ip', NOW())";

$result = mysql_query($sql);

}

}

$sql = "SELECT COUNT(*) FROM `my_counter`";

$result = mysql_query($sql);

$row = mysql_fetch_row($result);

print_r($row);

mysql_free_result($result);

mysql_close($conn);

?>