Write a dot instead of a comma when it's last element in PHP

I have a while loop use to write a list. i'd like every element separated with a comma, but write a dot after the last one, not a coma. Here is my code

$exec = mysql_query($req);
    while ($row = mysql_fetch_assoc($exec)){
    echo '<strong>'.$row['name'].'</strong>, ';
}
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But I don't know how to do that. I tried using count() or end(), but none of these works. A little help would be great !

$html = array();

$exec = mysql_query($req);
while ($row = mysql_fetch_assoc($exec)){
    $html[] = '<strong>' . htmlspecialchars($row['name']) . '</strong>';
    // --------------------^^^^^^^^^^^^^^^^! (1)
}

$html = implode(', ', $html) . '.';

(1) - Never output data to HTML without escaping it properly.

I like the use the implode function for this :)

$list = array();
$exec = mysql_query($req);
    while ($row = mysql_fetch_assoc($exec)){
    $list[] = '<strong>'.$row['name'].'</strong>';
}
$string = implode(", " , $list);
echo $string . ".";

HTH

Try this:

$exec = mysql_query($req);
$output = array();
while ($row = mysql_fetch_assoc($exec)){
    $output[] = '<strong>'.$row['name'].'</strong>';
}
echo implode(',', $output), '.';

Build the string but don't output. Then, trim off the command and add a fullstop:

$exec = mysql_query($req);
$output = "";

while ($row = mysql_fetch_assoc($exec))
{
    $output .= '<strong>'.htmlentities($row['name']).'</strong>, ';
}

if($output) echo rtrim($output, ', ').".";