Show corresponding message PHP

Good!

I'm doing a website at the university and it's the first time I use php, so I do not know much about the language and web development in general.

The problem I have is the following:

I have an array of objects called $ recibidos where I have saved all the messages that a user has received (each message is an object) and I show them in a table such that:

<tbody>
     <?php 
         for($i = 0; $i < count($recibidos); $i++) {
             echo '
                 <tr>
                     <td><a onclick="leer()">'.$recibidos[$i]->getAsunto().'</a></td>
                     <td>'.$recibidos[$i]->getEmisor().'</td>
                     <td>'.$recibidos[$i]->getFecha().'</td>
                 </tr>
             ';
         }
     ?>
</tbody>

The read () function only hides the table and shows the div to read the message (Everything is displayed on the same page).

This is the result:

So far so good, the problem is that I want that when I click on the subject field of the message I show you the corresponding message, but I do not know how to access it.

If I do something like this:

<div id="leer">
     <div>
         <label>De: </label> <?php echo $recibidos[$i]->getEmisor();?>
     </div>
 </div>

Obviously, it does not matter which message you click on because it is always going to show me the sender of the last message.

How can I do so by clicking on the first message read the fields of the first message? Do I have to create a separate variable or function, or is there some php function that allows me to do something like that?