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How to get form data from php database

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Oct 26, 2019 pm 04:17 PM

php database form

How to get form data from php database

php database to obtain the form content:

Example:

<?php
// 创建连接
$conn = new mysqli("localhost", "uesename", "password");
// 检测连接
if ($conn->connect_error)
{ 
 die("连接失败: " . $conn->connect_error);}
 // 创建数据库
 $sql = "CREATE DATABASE test";
  if ($conn->query($sql) === TRUE)
  { 
  echo "数据库创建成功";
  } else { 
  echo "Error creating database: " . $conn->error;
  }
 $conn->close();
?>

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Then use the CREATE TABLE statement to create a MySQL table and set the following fields.

id : It is unique, of type int , and selects the primary key.
#uesrname: User name, type is varchar, length is 30.
password: Password, type is varchar, length is 30.
confirm: Confirm password, type is varchar, length is 30.
email: Email, type is varchar, length is 30.

Then use sql statement to create the database table. The code is shown as follows:

<?php
 // 创建连接
 $conn = new mysqli("localhost", "uesename", "password","test");
 // 检测连接
 if ($conn->connect_error)
 { 
 die("连接失败: " . $conn->connect_error);
 }
 // 使用 sql 创建数据表
 $sql = "CREATE TABLE login (
 id INT(10) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
 username VARCHAR(30) NOT NULL,
 password VARCHAR(30) NOT NULL,
 confirm VARCHAR(30) NOT NULL,
 email VARCHAR(30) NOT NULL,
 )ENGINE=InnoDB DEFAULT CHARSET=utf8 ";
 if ($conn->query($sql) === TRUE)
 { 
 echo "Table MyGuests created successfully";
 } else { 
 echo "创建数据表错误: " . $conn->error;
 }
 $conn->close();
?>

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We have created the database and table above, and now we will create a simple form registration On the front-end page, the form page here is very simple, with a few simple text boxes such as username, password, password confirmation, registration email, etc. The code is as follows:

<!DOCTYPE html>
<html>
<head>
 <title>用户注册页面</title>
 <meta charset="UTF-8"/>
 <style type="text/css">
 *{margin:0px;padding:0px;}
 ul{
  width:400px;
  list-style:none;
  margin:50px auto;
 }
 li{
  padding:12px;
  position:relative;
 }
 label{
  width:80px;
  display:inline-block;
  float:left;
  line-height:30px;
 }
 input[type=&#39;text&#39;],input[type=&#39;password&#39;]{
  height:30px;
 }
 img{
  margin-left:10px;
 }
 input[type="submit"]{
  margin-left:80px;
  padding:5px 10px;
 }
 </style>
</head>
<body>
<form action="zhuce.php" method="post">
 <ul>
 <li>
  <label>用户名：</label>
  <input type="text" name="username" placeholder="请输入注册账号"/>
 </li>
 <li>
  <label>密 码：</label>
  <input type="password" name="password" placeholder="请输入密码" />
 </li>
 <li>
  <label>确认密码：</label>
  <input type="password" name="confirm" placeholder="请再次输入密码" />
 </li>
 <li>
  <label>邮 箱：</label>
  <input type="text" name="email" placeholder="请输入邮箱"/>
 </li>
 <li>
  <input type="submit" value="注册" />
 </li>
 </ul>
</form>
</body>
</html>

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Next, you need to use PHP code to submit the information submitted by the new user to the database. Use the POST method to transfer and obtain the value.

First of all, you need to connect to the database and table created previously, because the user name, password and other information registered by the new user need to be saved in the corresponding fields in the table. Before storing the data in the database table, make some judgments and verifications on the submitted data. For example, user names and emails that do not meet the requirements need to be filtered and error prompts are needed. Also, if the user name is registered by other users, you need to be prompted that you will not be able to To use this username again, this is to first read the username that already exists in the database and then make a judgment.

Simply put Store all the data submitted in the form into variables, and then judge the password and verification code. After they are correct, store the user information in the database and store the table of user information in the database. All data extracted from the file are printed out . To put it bluntly, the second half of the sentence is about data storage and retrieval. The specific code is as follows:

<?php
session_start();
header("Content-type:text/html;charset=utf-8");
$link = mysqli_connect(&#39;localhost&#39;,&#39;root&#39;,&#39;root&#39;,&#39;test&#39;);
if (!$link) {
 die("连接失败:".mysqli_connect_error());
}
$username = $_POST[&#39;username&#39;];
$password = $_POST[&#39;password&#39;];
$confirm = $_POST[&#39;confirm&#39;];
$email = $_POST[&#39;email&#39;];
if($username == "" || $password == "" || $confirm == "" || $email == "")
{
 echo "<script>alert(&#39;信息不能为空！重新填写&#39;);window.location.href=&#39;zhuce.html&#39;</script>";
} elseif ((strlen($username) < 3)||(!preg_match(&#39;/^\w+$/i&#39;, $username))) {
 echo "<script>alert(&#39;用户名至少3位且不含非法字符！重新填写&#39;);window.location.href=&#39;zhuce&#39;</script>";
 //判断用户名长度
}elseif(strlen($password) < 5){
 echo "<script>alert(&#39;密码至少5位！重新填写&#39;);window.location.href=&#39;zhuce.html&#39;</script>";
 //判断密码长度
}elseif($password != $confirm) {
 echo "<script>alert(&#39;两次密码不相同！重新填写&#39;);window.location.href=&#39;zhuce.html&#39;</script>";
 //检测两次输入密码是否相同
} elseif (!preg_match(&#39;/^[\w\.]+@\w+\.\w+$/i&#39;, $email)) {
 echo "<script>alert(&#39;邮箱不合法！重新填写&#39;);window.location.href=&#39;zhuce.html&#39;</script>";
 //判断邮箱格式是否合法
} elseif(mysqli_fetch_array(mysqli_query($link,"select * from login where username = &#39;$username&#39;"))){
 echo "<script>alert(&#39;用户名已存在&#39;);window.location.href=&#39;zhuce.html&#39;</script>";
} else{
 $sql= "insert into login(username, password, confirm, email)values(&#39;$username&#39;,&#39;$password&#39;,&#39;$confirm&#39;,&#39;$email&#39;)";
 //插入数据库
 if(!(mysqli_query($link,$sql))){
 echo "<script>alert(&#39;数据插入失败&#39;);window.location.href=&#39;zhuce.html&#39;</script>";
 }else{
 echo "<script>alert(&#39;注册成功！)</script>";
 }
}
?>

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