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Examples to explain how to implement radio selection function in PHP

PHPz

Apr 19, 2023 am 09:22 AM

With the continuous development of Internet informatization, the development of network applications has received more and more attention. As one of the most popular web development languages at present, PHP has also attracted much attention for its method of implementing radio selection function. In this article, we will introduce how to implement radio selection functionality using PHP.

Introduction to radio button boxes

The radio button box is a common form element that allows the user to select one from multiple options. Radio buttons are often used to collect user preferences, user surveys, and more. In HTML, the radio button uses the <input> tag, and sets type="radio", the example is as follows:

<input type="radio" name="gender" value="male"> Male<br>
<input type="radio" name="gender" value="female"> Female

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In the above example, we Two radio button boxes are defined, named gender. When the user selects a radio button, the form data will be passed to the server in the form of name=value. Among them, name specifies the name of the option, and value specifies the value of the radio button.

PHP implements radio button options

When using PHP to implement radio buttons, we usually need to obtain the user's selection through form submission. For example, when the user clicks on an option, we need to save its value into a variable. An example is as follows:

<form action="submit.php" method="post">
  <input type="radio" name="gender" value="male"> Male<br>
  <input type="radio" name="gender" value="female"> Female<br>
  <input type="submit" value="Submit">
</form>

<?php
  if($_SERVER["REQUEST_METHOD"] == "POST") {
    $gender = $_POST["gender"];
    echo "You selected " . $gender;
  }
?>

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In the above code, we define a form that has two radio buttons and a submit button. When the user selects a radio button and clicks the submit button, the form data will be submitted to the submit.php file. In the submit.php file, we use the $_POST super global variable to get the value selected by the user, and then output it to the page.

Example program: Statistics of users by gender

Let’s take a look at a more practical example. Let's say we have a registration page that requires users to fill in their name, age, and gender information. After users submit registration information, we need to count the number of users according to gender and output the statistical results on the page. The code is as follows:

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Register User</title>
</head>
<body>
  <form action="register.php" method="post">
    Name:
    <input type="text" name="username"><br>
    Age:
    <input type="text" name="age"><br>
    Gender:
    <input type="radio" name="gender" value="male"> Male
    <input type="radio" name="gender" value="female"> Female
    <br>
    <input type="submit" value="Submit">
  </form> 
</body>
</html>

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In register.php, we count the number of users based on their gender information and output it to the page. The code is as follows:

<?php
  $servername = "localhost";
  $username = "username";
  $password = "password";
  $dbname = "myDB";

  // 创建连接
  $conn = new mysqli($servername, $username, $password, $dbname);

  // 检查连接是否成功
  if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
  }

  // 获取用户输入信息
  $username = $_POST["username"];
  $age = $_POST["age"];
  $gender = $_POST["gender"];

  // 插入数据到数据库
  $sql = "INSERT INTO users (username, age, gender) VALUES ('$username', '$age', '$gender')";

  if ($conn->query($sql) === TRUE) {
    echo "New record created successfully";
  } else {
    echo "Error: " . $sql . "<br>" . $conn->error;
  }

  // 按性别统计用户数量
  $result = $conn->query("SELECT COUNT(*) FROM users WHERE gender = 'male'");
  $row = $result->fetch_assoc();
  $male_count = $row["COUNT(*)"];

  $result = $conn->query("SELECT COUNT(*) FROM users WHERE gender = 'female'");
  $row = $result->fetch_assoc();
  $female_count = $row["COUNT(*)"];

  // 输出统计结果
  echo "Male users: " . $male_count . "<br>";
  echo "Female users: " . $female_count;

  // 关闭连接
  $conn->close();
?>

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In the above code, we create an object connected to the database and use $POST to obtain the user's input information. We then insert the user information into our database via $conn->query(). Next, we use $conn->query() to query the number of users of different genders. Finally, we output the statistical results and close the database connection.

Summary

This article introduces how to use PHP to implement radio button boxes, and uses a practical example to illustrate how to count users according to gender. Of course, in actual project implementation, you also need to pay attention to security and user experience, such as data input verification, exception handling, etc. I hope this article can help everyone better understand and apply PHP. I also hope that everyone can make good use of radio buttons to bring a better experience to users.

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