How to display uneditable data on a form and read it back to the server

See more:

HTML

PHP

I have populated a table on an HTML WEB page from a MySQL table using a loop. At the end of each row I have included a checkbox. The data from the table is store in the table cells using a input type="text" box. I do not want the user to change any of the table data displayed in the text boxes but I do want them to check some of the check boxes.
Code for creating the table is as follows;

$x = 0;
               while ( $db_field = mysqli_fetch_assoc($result) ) {
                  $_SESSION["Opponent"] = $db_field['Opponents'];
                  $uOpponentName = $_SESSION["Opponent"];
                  $_SESSION["Venue"] = $db_field['Venue'];
                  $uVenue = $_SESSION["Venue"];
                  $originalDate = $db_field['Date'];
                  $_SESSION["Date"]  = date("d-m-Y", strtotime($originalDate));
                  $uPlayer = $_SESSION["Player"];
                  $SQL = "SELECT * FROM ".DB_AVAIL." WHERE opponents = '$uOpponentName' AND venue = '$uVenue' AND player_name = '$uPlayer'";
                  $result2 = mysqli_query($db_handle, $SQL);
                  $x=$x + 1;

                  if ($result2->num_rows >0) {
                      echo'<tr>
                    <td style="width: 150px;"><input type="text" name="oppon'.$x.'" size="20" value="'.$_SESSION["Opponent"].'" ></input></td>
                    <td style="width: 37px;"><input type="text" name="ven'.$x.'" size="5" value="'.$_SESSION["Venue"].'" ></input></td>
                    <td style="width: 80px;"><input type="text" name="dat'.$x.'" size="10" value="'.$_SESSION["Date"].'" ></input></td>
                    <td style="width: 100px;" align = "center"><input type="checkbox" name="avail'.$x.'" value="avail" checked="checked"></td>
                    </tr> ';
              }else{
                 echo'<tr>
                    <td style="width: 150px;"><input type="text" name="oppon'.$x.'" size="20" value="'.$_SESSION["Opponent"].'" ></input></td>
                    <td style="width: 37px;"><input type="text" name="ven'.$x.'" size="5" value="'.$_SESSION["Venue"].'" ></input></td>
                    <td style="width: 80px;"><input type="text" name="dat'.$x.'" size="10" value="'.$_SESSION["Date"].'" ></input></td>
                    <td style="width: 100px;" align = "center"><input  type="checkbox" name="avail'.$x.'" value="avail"></td>
                    </tr> ';
                }}} ?>

To save the data back into another table based on whether the checkbox has been checked I used the following code;

$y = $_SESSION["RowCount"];
for ($x = 1; $x <= $y; $x++) {
    $Already = false;
    if (isset($_POST['avail'.$x.''])) {
        $uPlayerName = $_SESSION["Player"];
        $uOpponent = $_POST['oppon'.$x.''];
        $uVenue = $_POST['ven'.$x.''];
        

//// check to see it player already in the availabilty list for this match
        $SQL = "SELECT `player_name` FROM ".DB_AVAIL." WHERE `opponents`= '$uOpponent' AND `venue`= '$uVenue'";

        $result = $conn->query($SQL);

        if ($result->num_rows >0) {
            while($row = $result->fetch_assoc()) {
                $PlayerName = $row['player_name'];
                    If ($uPlayerName==$PlayerName ){
                        $Already = true;
                        Break;
                    }
            } 
        }
// sql to add a record
If ($Already == false){
    $sql = "INSERT INTO ".DB_AVAIL." (`player_name`, `opponents`, `venue`) VALUES ('$uPlayerName','$uOpponent','$uVenue')";
    if ($conn->query($sql) === FALSE) {
        print "Error adding record: " .  $sql . "<br>" . $conn->error;
    }
}

All this works okay but the Text boxes are open to editing, which I do not want.
Question is, how can I display the table data on a HTML form so that it cannot be edited but can still be passed back to the server in PHP to be processed and saved as necessary?

What I have tried:

I tried disabling the Text boxes by change the code as follows

<td style="width: 150px;"><input type="text" name="oppon'.$x.'" size="20" value="'.$_SESSION["Opponent"].'" ></input></td>

to the

<td style="width: 150px;"><input type="text" name="oppon'.$x.'" size="20" value="'.$_SESSION["Opponent"].'" disable></input></td>

however this failed as the $_POST['oppon'.$x.''] variable was not generated by the HTML page.