Hyperlink is not showing 'sr' from database [duplicate]

echo 'Delete' is not showing 'sr' from database in hyperlink when I hover over the "delete" button. Full code is attached below. Let me know if find the issue.

            if ($result->num_rows > 0) {
              // output data of each row
              echo "<table border = '1'>
              <tr>
                <th>Sr. No</th>
                <th>Task Title</th>
                <th>Task Details</th>
                <th>Action</th>
              </tr>";

              while($row = mysqli_fetch_array($result)) {
           
                echo "<tr>";
                echo "<td>". $row["sr"] . "</td>";
                echo "<td>". $row["task_title"] ."</td>";
                echo "<td>". $row["task_details"] . "</td>";
                echo "<td>" ;
                echo '<a href="http://localhost/crudapp/crud_functions/delete.php?sr=$row[sr]">Delete</a>';
                echo "</td>";
                echo "</tr>";
              }
              echo " </table>";
            }

source https://stackoverflow.com/questions/70137098/hyperlink-is-not-showing-sr-from-database

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