How to give alternating table rows different background colors using PHP

Or you could just use CSS:

table tr:nth-child(odd) { background-color: #ccc; }

<?php 

$x++; 

$class = ($x%2 == 0)? 'whiteBackground': 'grayBackground';

echo "<tr class='$class'>";

?>

It basically checks to see if $x is divisible evenly by 2. If it is, it is even.

P.S. if you haven't seen that style of if else query, it is called a ternary operator.

Set a variable to true/false or a number and then back again during each iteration. Or use the modulus operator such as $i%2==0 in a while loop where $i is a number and use this condition in a ternary statement or something that sets the class value of the <tr>

Easiest way to alternate row colors in PHP/HTML?

$i = 0;
while ( $row = mysql_fetch_assoc($result) ) {
 echo '<tr class="' . ( ( $i %2 == 0 ) ? 'oneValue' : 'anotherValue' ) . '"><td>' . $row['something'] . '</td></tr>';
$i++;
}