Question

I have a loop that displays <li>‘s and I need to add a class to the 1st and then every six <li>‘s

Example:

while ($db_field = mysql_fetch_assoc($result)) {

    <li (if mod of 6 add class="something")>One</li>
    <li>Two</li>
    <li>Three</li>
    <li>Four</li>
    <li>Five</li>
    <li class="something">Six</li>
    <li>Seven</li>

}
...

Answer 1

It’s quite easy using the modulus % operator:

$counter = 0;
while ($r = mysql_fetch_assoc($res) {
    $isSixthsLi = (bool) (($counter++) % 6 == 0); 
    echo $isSixthsLi ? '<li class="something">' : '<li>';
    echo htmlentities($r['content']);
    echo '</li>';
}

The ($counter++) % 6 expression means the remainder of $counter divided by 6, then increment $counter. If the remainder is zero (and this is true for 0, 6, 12, …), then you print the <li> with a class name, else you did not.