Question

Possible Duplicate:
php: how to add odd/even loop in array

I am generating a table in php with the below code.

<?PHP
while ($row = $mydata->fetch())
{
  $tests[] = array(
  'a' => $row['a'], 
  'b' => $row['b']
  )
  ;
}

?>

Then the output code

<table>
  <tbody>
  <tr><th>#</th><th>a</th><th>b</th></tr>
  <?php foreach ($tests as $test): ?>
    <tr class="">
        <td></td>
        <td><?php htmlout($test['a']); ?></td>
        <td><?php htmlout($test['b']); ?></td>
    </tr>
<?php endforeach; ?>
  </tbody>
  </table>

which outputs

<table>
  <tbody>
  <tr><th>#</th><th>a</th><th>b</th></tr>
    <tr class="">
        <td></td><td>a content</td><td>b content</td>
    </tr>
    <tr class="">
        <td></td><td>a content</td><td>b content</td>
    </tr>
  </tbody>
  </table>

htmlout is the below custom function.

<?php
function html($text)
{
return htmlspecialchars($text, ENT_QUOTES, 'UTF-8');
}
function htmlout($text)
{
echo html($text);
}
?>

This is all working well but I can’t work out two things here.

1. I want my rows to generate <tr class="odd"> and <tr class="even"> on alternate rows
2. I want the first <td></td> within the <tr> to count show the row number of the data eg <td>1</td> in the first <tr class=""> <td>2</td> in the second etc.

I have looked at numerous examples such as this

$count = 1;
while ($count <= 10)
{
echo "$count ";
++$count;
}

But can’t work out how to implent it into my example or maybe I should use another method. I understand I can do the table rows in jQuery and in some browsers with css3 but would prefer a php solution in this case.

Answer 1

You can use something like this:

<?php foreach ($tests as $i => $test): ?>
    <?php $class = ($i % 2 == 0) ? 'even' : 'odd'; ?>
    <tr class="<?php echo $class; ?>">
        <td><?php echo $i + 1; ?></td>
        <td><?php htmlout($test['a']); ?></td>
        <td><?php htmlout($test['b']); ?></td>
    </tr>
<?php endforeach; ?>

This leverages the fact that the array keeps a numerical index $i. So, the row number is really $i + 1, which we put into the first column. Then, we determine if the current row is even or odd based on whether or not $i is divisible by 2. If $i is divisible by 2, it’s an even row, otherwise it’s an odd row. We save the class string in $class, and put it in the <tr> tag.