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Dear Sir/Madame

I am trying to insert comments into a table called comments using echo ID in the input form but so far i can insert the comments with the post id but unable re-comment again kindly help me what do i do? 

This is the input form:

        <form action="ehscomment.php" method="post">
        <input type="hidden" name="id" value="<?php echo $id ?>"> 
                <label>Add comment</label>
        <textarea rows="6" cols="110" name="comment" placeholder="comment"></textarea>
            <input type="submit" name="postcomment" value="comment"></form>

And this is ehscomment.php

$servername = "localhost";
$username = "root";
$password = "";
$dbname = "registration";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
   die("Connection failed: " . $conn->connect_error);
       $id = $_POST['id'];
       $comment = $_POST['comment'];

$sql = "INSERT INTO comments (id,comment)
VALUES ('$id','$comment')";

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


Error message: Error: INSERT INTO comments (id,comment) VALUES ('242','asddd')
Duplicate entry '242' for key 'PRIMARY'

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If you're trying to comment on an existing comment, you need a parent_id column in your table. The id of the initial comment would then go into that column.

For a more robust and future-proof solution, you'd create a separate table to track the parent/child relationships between comments, but the idea is the same.

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