convert the result set foreach to for loop in php

Question

I am doing a project in codeigniter.Here I want to fetch the fields time and url to view.I want to show something like this

The first field is time and second one is url.I used the following code to fetch the value

foreach ($path as $row) {
    ?>
    <tr>
        <td>
            <a href="#">
                <div class="span6 pull-left"><?php echo $row->time;</div>
                <div class="span3 pull-left"><?php echo $row->url ?></div>
            </a>

        </td>
    </tr>
    <?php
}
?>

But actually the first row of time is the difference between the time on first row and the second row.And the time on second row is the difference between time on second row and third row so on.I have tried with foreach loop.But I didnt get any idea to implement this.Anyone help me for converting this foreach loop to for loop to accomplish the task.

Thanks in advance.

Answer 1

maybe something like..

for( $i = 0 ; $i < count($path) ; $i++ ) {
    $time = $path[$i]->time - $path[$i+1]->time;
}

be aware issue with last index..