An example of how to implement the message function in PHP-PHP Problem-php.cn

An example of how to implement the message function in PHP

PHPz

Release： 2023-04-03 17:06:02

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PHP is a very popular server-side scripting language used for website development. It works with HTML and is ideal for processing web form data, including leaving comments.

Let’s look at the implementation code of a simple PHP message function, which includes the following parts:

Create message form

Message requirements The user enters the title and content, which we can do using an HTML form. The code is as follows:

<!DOCTYPE html>
<html>
<head>
  <title>PHP留言板</title>
</head>
<body>
  <h2>留言板</h2>
  <form action="submit.php" method="post">
    <label>标题:</label>
    <input type="text" name="title"><br>
    <label>内容:</label>
    <textarea name="content" rows="5" cols="40"></textarea><br>
    <input type="submit" value="提交">
  </form>
</body>
</html>

Copy after login

In this message board, we use the HTTP POST method to submit the message data to the submit.php page for processing.

Processing message data

When the user clicks the "Submit" button, we need a PHP script to process the message data. The code is as follows:

<?php
  $title = $_POST[&#39;title&#39;];
  $content = $_POST[&#39;content&#39;];
  
  // 检查用户是否输入了标题和内容
  if (empty($title) || empty($content)) {
    echo "请输入标题和内容。";
  } else {
    // 将留言保存到文件中
    $file = fopen("messages.txt", "a");
    fwrite($file, $title . "\n" . $content . "\n\n");
    fclose($file);
    
    echo "留言已发布。";
  }
?>

Copy after login

In this script, we first get the title and content entered by the user from the form. Then we check if the user entered the title and content. If no input is entered, an error message is displayed. Otherwise, we open a text file called "messages.txt", write the message into it, and close the file.

Display message list

Finally, we need a PHP script to display the message list. The code is as follows:

<!DOCTYPE html>
<html>
<head>
  <title>PHP留言板</title>
</head>
<body>
  <h2>留言板</h2>
  <ul>
    <?php
      $file = fopen("messages.txt", "r");
      while (!feof($file)) {
        $title = fgets($file);
        $content = fgets($file);
        if (!empty($title) && !empty($content)) {
          echo "<li><strong>" . $title . "</strong><br>" . $content . "</li>";
        }
      }
      fclose($file);
    ?>
  </ul>
</body>
</html>

Copy after login

In this script, we use PHP's fgets() function to read the title and content of each message from a text file and display them in an HTML list element.

Summary

With the above code, we can easily implement a PHP message board. Of course, this code is just an example and may not meet all needs. In actual applications, you may need to add functions such as data validation and comment reply. But the core idea of this code can help you better understand PHP development.

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