如何自动将用户输入的数据存储在单独的文件中，以便将其显示给其他用户？

Question

我试图获取每个帖子的帖子ID，但内容没有出现。有人能指出我正确的方向吗？

的index.php

<?php

   include 'main.php';
   include 'dbconnect.php';

   $findPosts = "SELECT * FROM Posts ORDER BY Date DESC";
   $showPosts = mysqli_query($db, $findPosts) or die(mysqli_error);

   while ($currentrow = mysqli_fetch_array($showPosts)) {

       //echo each post title as a link contained in a div box.//
       echo '<div class="box">';
       echo '<a href="view_post.php" class="PostTitle">'.$currentrow['Title'].'</a>';
       echo '<p class="Date">'.$currentrow['Date'].'</p>';
       echo '</div>';
   }
?>

每个链接的目标属性为 view_post.php

<?php

  include "dbconnect.php";
  include "main.php";

  $post_id = $_POST['ID'];
  $sql = "SELECT * FROM Posts WHERE ID = '".$post_id."' LIMIT 1"; 
  $res = mysqli_query($sql) or die(mysqli_error());
  if (mysql_num_rows($res) == 1) {

      //Echo a table containing each post's title, content and date.//
      echo "<tr><td valign='top' style='border: 1px solid #000000;'><div style='min-height: 125px;'>".$row['Title']."<br /> 
  -".$row['Date']."<hr />".$row['Content']."</div></td><td width: '200px' valign='top' align='center' style='border: 1px solid #000000;'>
  User Info Here</td></tr><tr><td colsplan='2'><hr /></td></tr>";

  } else {
      echo "<p>This post does not exist.</p>";
  }
?>