php while loop – html a href inside loop of data

I’m trying to get my while loop to function when fetching data that is equal to input field.
The Data set is functional, but I want to add a read, update and delete function to each field of data through an with allocated ID.

                  <tbody>";
                    while($row=$result->fetch_assoc()){
                        $output .="
                        <tr>
                            <td>".$row['id']."</td>
                            <td>".$row['fornavn']."</td>
                            <td>".$row['efternavn']."</td>
                            <td>".$row['mail']."</td>
                            <td>".$row['kursistnummer']."</td>
                            <td>".$row['unilogin']."</td>
                            
                            <td><a href="read.php?id='. $row['id'] .'" class="mr-3" title="View Record" data-toggle="tooltip"><span class="fa fa-eye"></span></a></td>
                        </tr>";
                    }
                    $output .="</tbody>";
                    echo $output;

It outputs the following error

"Parse error: syntax error, unexpected identifier "read" in
C:\xampp\htdocs\helloworld\action.php on line 38"

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so im guessing its a syntax error in my href

>Solution :

You must escape double quotes in your string:

<?php

    $output .="<tr>
                 <td>".$row['id']."</td>
                 <td>".$row['fornavn']."</td>
                 <td>".$row['efternavn']."</td>
                 <td>".$row['mail']."</td>
                 <td>".$row['kursistnummer']."</td>
                 <td>".$row['unilogin']."</td>
                 <td><a href=\"read.php?id=". $row['id'] ." class=\"mr-3\" title=\"View Record\" data-toggle=\"tooltip\"><span class=\"fa fa-eye\"></span></a></td>
               </tr>";

Or better to use sprintf function in next way:

$output .= sprintf(
    '<tr>
        <td>%s</td>
        <td>%s</td>
        <td>%s</td>
        <td>%s</td>
        <td>%s</td>
        <td>%s</td>
        <td>
            <a href="read.php?id=%s class="mr-3" title="View Record" data-toggle="tooltip">
                <span class="fa fa-eye"></span>
            </a>
        </td>
    </tr>',
    $row['id'], $row['fornavn'], $row['efternavn'], $row['mail'], $row['kursistnummer'], $row['unilogin'], $row['id']
);