How to separate with comma values fetched by loop from mysql database with php

Question

I am creating a web application which requires a kind of series of related data from database, and those data should be separated by commas,

For hint : I am fetching those values with while loop

<?php while ( $writer = mysqli_fetch_assoc($sqi8)) { ?>
<?=$writer['fullname']; ?>
<?php } ?>

So in the code above there more than one names from the database and i want to separate them with comma when they are fetched

Answer 1

A cleaner way to achieve that would be this:

<?php
    $fullNames = [];
    while ($row = mysqli_fetch_assoc($sqi8)) {
        $fullNames[] = $row["fullname"];
    }

    foreach ($fullNames as $fullName) { ?>
       <a href="cast-profile.php?cast=<?=$fullName;?>"><?=$fullName; ?> </a>,  
<?php
    } 
?>