Passing a value through Button to Php function

You need both the action (edit/delete) and the row id. Unfortunately, without some JS the button will only post one value.

You can create a new form for each row, add in a hidden element. For example:

<?php while ($row = mysql_fetch_array($query)) : ?>

  <tr>
    <!-- other cells -->
    <td>
      <form method="post" action="">
        <input type="submit" name="action" value="Edit"/>
        <input type="submit" name="action" value="Update"/>
        <input type="hidden" name="id" value="<?php echo $row['id']; ?>"/>
      </form>
    </td>
  </tr>

<?php endwhile; ?>

Then after posting it you can just check for the action and id

if ($_POST['action'] && $_POST['id']) {
  if ($_POST['action'] == 'Edit') {
    // edit the post with $_POST['id']
  }
}

You can do it one of two ways.

jQuery and AJAX

For each <tr>, everywhere there is a delete button,

<a href="#" data-id="<?php echo $value; ?>" class="delete-row">Delete</a>

Script at the bottom:

//Include jQuery here
<script language="javascript">
$('.delete-row').click(function (event) {
   event.preventDefault();
   var id = $(this).data('id');
   $.ajax({
      url: "url/to/delete",
      method: "POST",
      cache: false,
      data: { id: id },
      success: function (html) {
         $(this).parent().parent().remove();
      });
   });
});
</script>

This puts the ID of the row into the <a href> itself using data and uses jQuery to send out an AJAX call to delete the record. If the delete is successful, it removes the row from the table.

Old-School Button

For each <tr>, everywhere there is a Delete button,

<form method="POST" action="url/to/delete">
<input type="hidden" name="id" value="<?php echo $value; ?>" />
<input type="submit" value="Delete" />
</form>

This is the old-school way to do it, where the hidden field is how the backend knows which row to delete.

On the backend, you still use $_POST['id']; to get the ID of the record to remove. In the above examples, $value is the ID for each row, and is most likely something like $row['id'] when it is coming from a foreach().

Use a hidden input (e.g.<input type="hidden" value="your_value_here">)