PHP和MySQL表格。添加空行

Question

我在使用PHP時遇到了問題，那就是將數據添加到MYSQL數據庫：

<?php require("config/connection.php"); ?>
<?php require("includes/functions.php"); ?>

<?php
$username = $_POST['username'];
$password = $_POST['password'];

$error='';// zmienna do błędów

if(isset($_POST[submit])){



 if(trim($_POST[username])=='' || strlen(trim($_POST[username])) < 6 ||strlen(trim($_POST[username])) >12){


     $error.="Name must be between 6 ad 12 chars<br />";

 }  

}if($error==''){  // if no error, do a query

    $sql = @mysql_query("INSERT INTO users SET username=\"$username\", password=\"$password\"");




}

    else {

     echo "<span style=color:red>$error</span>";

    }   

    mysql_close($connection);

?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Untitled Document</title>
</head>

<body>
<h2>Add user</h2>

<form action="add.php" method="post">

<p>Name: <input type="text" name="username" id="username" /></p>
<p>Password: <input type="text" name="password" id="password" /></p>
<p> <input type="submit" value="submit  " name="submit" /></p>

</form> 

<a href="index.php">Cancel</a>

</body>
</html>

主要問題是，當我在此處輸入用戶名和密碼時，得到的是：

http://i.padsbanger.pl/img/cdf5b5p988ga

出於未知的原因，它添加了一個空行，之后又添加了我確實輸入到表單中的內容。 有什么幫助嗎？

Answer 1

您執行兩次查詢，一次在頁面加載時，然后再次在提交時

$error='';
if(isset($_POST[submit])){
 if(trim($_POST[username])=='' || strlen(trim($_POST[username])) < 6 ||strlen(trim($_POST[username])) >12){
     $error.="Name must be between 6 ad 12 chars<br />";
 }  
}// closes if(isset   *** move this until after the next if statement ***

//this is run everytime as its outside the if(isset block
if($error==''){  // errors is initialised as '' so this will run
    $sql = @mysql_query("INSERT INTO users SET username=\"$username\", password=\"$password\"");
}

if(isset($_POST[submit])){ if(isset($_POST['submit'])){應該是if(isset($_POST['submit'])){

SQL注入 -您應該閱讀

PHP和MySQL表格。添加空行

問題描述

1 個解決方案

解決方案1
4 已采納 2011-12-08 20:21:14

PHP和MySQL表格。 添加空行

問題描述

1 個解決方案

解決方案1 4 已采納 2011-12-08 20:21:14

PHP和MySQL表格。添加空行

解決方案1
4 已采納 2011-12-08 20:21:14