Loading comments from Database - php

Question

I am developing a simple forum for my php project. I have a viewpost.php file which displays all the posts and has a read more button.like this.
<?php
foreach($rows as $output){
echo '<div id="dd">';
$uid = $output['uid'];
$result2 = $conn->prepare("SELECT username FROM users WHERE uid = '$uid'");
$result2->execute();
$rows2 = $result2->fetchAll();
foreach($rows2 as $username_row){
echo 'POST BY '.$username_row['username'].':';}
echo '<h3>Title:'.$output['title'].'</h4>';
?>
<form action="comments.php" method="post">
<input type="submit" value="Read more" name="">
</form>
<?php
echo '</div>';
}
?>
now I want to load post and comments in comments.php. but I want post_id to retrieve post,title and comments from the database. I wonder how to pass the post_id from viewpost.php to comments.php when the user clicks on the readmore button.any help will be really appreciable am a newbee.

Answer 1

You can add a input to your form
<input type="hidden" value="<?php echo $output['id'] ?>" name="id" />
and in your comments.php file use $_POST['id']
or use URL like :
<a href="comments.php?id='<?php echo $output['id'] ; ?>'">
and in your comments.php file use $_GET['id']