Question

I have a PHP loop that displays data for a particular posting on my website. What I want to do is dynamically assign either and even/odd CSS class for the number of row that is returned. For example,

first row returned - odd class
second row returned - even class
third row - odd class

This will allow me to assign different background colors to keep the data visually separate.

I should clarify – this data isn’t being returned in a table.

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

    echo "
    <div class=\"songContainer\" id=\"" . $row['trackid'] . "\">

Answer 1

Depending on which browsers you have to target, you could just do that with CSS:

.mytable tr:nth-child(even) { background-color: #FFF; }
.mytable tr:nth-child(odd) { background-color: #EEE; }

You can even do more complex things with this pseudo-class: http://www.quirksmode.org/css/nthchild.html

If you really need PHP, use a modulo:

$i = 0;
foreach ($arr as $val) {
    if (0 == $i % 2) {
        // even
    }
    else {
        // odd
    }
    $i++;
}