Question

I’m trying to make in sort that odd <tr> and even <tr> have different color for easier reading.

Here’s my code:

$show_res = mysql_query($show_query);
while ($show_row = mysql_fetch_assoc($show_res)){
$rc++;
if (($rc > 1)){
    $tr = '#cccccc';
} else {
    $tr = '#ffffff';
}?>
  <tr style="background-color:<?php echo $tr ;?>">

It doesn’t work, am I missing something?

Answer 1

You want to use modulo %

Some examples:

• 5 % 2 = remainder is 1
• 4 % 2 = remainder is 0
• 6 % 2 = remainder is 0
• 9 % 2 = remainder is 1

So based on whether the remainder is 1 or 0 you change the color. And you want the <tr> element to be a part of your loop as that’s constantly being changed from one color or the other, back and forth.

$show_res = mysql_query($show_query);
while ($show_row = mysql_fetch_assoc($show_res))
{
    $rc++;
    if ($rc % 2 == 1)
    {
        $tr = '#cccccc';
    } 
    else 
    {
        $tr = '#ffffff';    
?>
  <tr style="background-color:<?php echo $tr ;?>">
<?
    }
}
?>