Question

我使用PHP创建了一个订阅按钮。每当我点击订阅按钮，而不是去数据库，它会被卡在filter_var（）PHP代码上，这些代码回显了正确的电子邮件。经过深思熟虑，我无法弄清楚问题。这是我的PHP代码

<?php 
include 'conn.php';
   $email=mysqli_real_escape_string($conn, $_POST['email']);
  if (isset($_POST['submit'])) {
      $sql= "SELECT * FROM subscribe WHERE email='$email'";
      $result=mysqli_query($conn, $sql);
      $row=mysqli_num_rows($result);
    if ($email=mysqli_fetch_assoc($result)) {
       echo "<span style='color:red'>*you are already subscribed</span>";
    }else{
    if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
      echo "<span>Put correct email<span>";
    }else{
       $enter= "INSERT INTO `subscribe` (`id`, `email`) VALUES (NULL, '$email');";

       msqli_query($conn, $enter);
       echo "<span style='color:green;'>Thank you for subscribing";
    }
  }
  } else{
    echo "something went wrong";
  }
?>

请参阅此代码

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
      echo "<span>Put correct email<span>";

当上半部分正常工作时，它会卡在这一部分，即当我输入相同的电子邮件时它会运行回声功能。

我也在使用jquery在同一页面上运行该功能

 <script>
    $(document).ready(function () {
        $('#subscribe-form').submit(function(event) {
            event.preventDefault();
            var email=$("input[name='email']").val();
            var submit=$("#submit").val();
            $('.sub').load('subscription.inc.php', {
                email:email,
                submit:submit
            })
        });
    });

    </script>

Answer 1

请更改条件：

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
  echo "<span>Put correct email<span>";

为：

if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
  echo "<span>Put correct email<span>";

因为filter_var()返回过滤后的文字。并在此返回一些文本，以便条件成真。

Answer 2

如果您有自动增量，则需要从查询中删除Id。因为数据库管理自己。而你在这里打字错误。

msqli_query($conn, $enter);

应该是

mysqli_query($conn, $enter);

并改变

if ($email=mysqli_fetch_assoc($result)) {

使用

if ($row>0) {

完整代码：subscription.inc.php

 <?php 
include 'conn.php';
if (isset($_POST['submit'])) {
  $email=mysqli_real_escape_string($conn, $_POST['email']);
  $sql= "SELECT * FROM subscribe WHERE email='$email'";
  $result=mysqli_query($conn, $sql);
  $row=mysqli_num_rows($result);
  if ($row>0) {
    echo "<span style='color:red'>*you are already subscribed</span>";
  }
  else
  {
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
      echo "<span>Put correct email<span>";
    }
    else
    {
      $enter= "INSERT INTO `subscribe` (`email`) VALUES ('$email')";
      mysqli_query($conn, $enter);
      echo "<span style='color:green;'>Thank you for subscribing";
    }
  }
}

?>

和html表单：

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
  <form method="post" action="subscription.inc.php" id="subscribe-form"> 
    <input type='text' placeholder="enter your email" name="email" id="#email">
    <br/> 
    <button class="btn" role="button" type="submit" name="submit" id="submit"> subscribe </button> 
    <p class="sub"></p> 
  </form>
</body>
</html>

为什么我的数据没有插入数据库

2 个答案: