mysqli_stmt :: bind_param()[mysqli-stmt.bind-param]:变量数与参数个数不匹配

时间:2013-01-30 13:21:50

标签: php mysql md5

我的php表单在我的表中插入了几列和一个加密的密码。但是,当我运行它时,它表示变量数与参数数量不匹配。这是我的代码:

<?php
if (isset($_POST['insert'])) {
require_once 'login.php'; 

  $OK = false;
  $conn = new mysqli ($host, $user, $password, $database) or die("Connection Failed");
  $stmt = $conn->stmt_init();


  $sql = 'INSERT INTO users (user_email, user_name, user_pref, user_password)
          VALUES(?, ?, ?, des_encrypt(substring(md5(rand()),1,8)))';
  if ($stmt->prepare($sql)) {
    // bind parameters and execute statement
    $stmt->bind_param('ssss', $_POST['user_email'], $_POST['user_name'], $_POST['user_pref'], $_POST['user_password']);
    // execute and get number of affected rows
    $stmt->execute();
    if ($stmt->affected_rows > 0) {
      $OK = true;
    }
  }
  if ($OK) {
    header('Location: confirm.php');
    exit;
  } else {
    $error = $stmt->error;
  }
}
?>
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Add User</title>
</head>

<body>
<h1>Add User</h1>
<?php if (isset($error)) {
  echo "<p>Error: $error</p>";
} ?>
<form id="form1" method="post" action="">
  <p>
    <label for="user_email">User email:</label>
    <input name="user_email" type="text" class="widebox" id="user_email">
  </p>
    <p>
    <label for="user_name">User name:</label>
    <input name="user_name" type="text" class="widebox" id="user_name">
  </p>
    <p>
    User role: <select name = "user_pref">
    <option value = "BLU">Blue</option>
    <option value = "YEL">Yellow<option>
    <option value = "GRE">GREEN</option>
    </select>
</p>
  <p>
    <input type="submit" name="insert" value="Register New User" id="insert">
  </p>
</form>
</body>
</html>

当我在没有ENCRYPTED PASSWORD的情况下测试表单时它工作正常,所以当我试图插入密码时,这一行会引起问题:

$stmt->bind_param('ssss', $_POST['user_email'], $_POST['user_name'], $_POST['user_pref'], $_POST['user_password']);

我是否应该将字符串更改为其他密码?

感谢

3 个答案:

答案 0 :(得分:2)

$sql = 'INSERT INTO users (user_email, user_name, user_pref, user_password)
      VALUES(?, ?, ?, des_encrypt(substring(md5(rand()),1,8)))';

仅定义3个占位符,但您尝试写入4个占位符。

$stmt->bind_param('ssss', $_POST['user_email'], $_POST['user_name'], $_POST['user_pref'], $_POST['user_password']);

每一个?在准备好的SQL语句中插入时,必须在bind_param中传递一个变量。

答案 1 :(得分:2)

你在这里传递了四个变量:

$stmt->bind_param('ssss', $_POST['user_email'], $_POST['user_name'], $_POST['user_pref'], $_POST['user_password']);

但只需要其中三个

 $sql = 'INSERT INTO users (user_email, user_name, user_pref, user_password)
      VALUES(?, ?, ?, des_encrypt(substring(md5(rand()),1,8)))';

见“?”标记,它将被替换为bild_params。 您可能希望将SQL查询替换为下一个:

     $sql = 'INSERT INTO users (user_email, user_name, user_pref, user_password)
      VALUES(?, ?, ?, des_encrypt(substring(md5(?),1,8)))';

答案 2 :(得分:1)

查询所采用的参数数量取决于查询中?的数量。

您的查询中有3个?

$sql = 'INSERT INTO users (user_email, user_name, user_pref, user_password) 
        VALUES(?, ?, ?, des_encrypt(substring(md5(rand()),1,8)))';

并且您在bind_param中传递了5个参数:

$stmt->bind_param($_POST['user_email'], $_POST['user_name'], $_POST['user_pref']);

有两种可能的解决方案:

  1. 在查询中选择5个参数:

    $sql = 'INSERT INTO users (user_email, user_name, user_pref, user_password) 
            VALUES(?, ?, ?, ?, des_encrypt(?))';
    
  2. bind_param函数中仅传递3个参数:

    $stmt->bind_param('ssss', $_POST['user_email'], $_POST['user_name'], $_POST['user_pref'], $_POST['user_password']);