php - 从while循环中删除最后一个逗号

Question

我的代码导致这样的输出

标题1,1,标题2,2,

我怎样才能从中删除最后一个逗号？

$comma = ",";

$query = "SELECT name, listid FROM playlist ORDER BY id DESC";
$result = $mysqli->query($query);

while(list($name, $listid) = $result->fetch_row()) {
    echo $name;
    echo $comma;
    echo $listid;
echo $comma;
}

Answer 1

$lines = array();

while(list($name, $listid) = $result->fetch_row()) {
    $lines[] = "$name,$listid";
}

echo implode(',', $lines);