PHP for循环 - 如何逃避第一次迭代？

Given this PHP for loop

$row->frequency = 1;
$row->date_1 = 10000;
$row->interval = 86400;


    for ($i = 0; $i <= $row->frequency; $i++) {

        $cal_data[] = array(

            'start' => strtotime($row->date_1) + $row->interval,

            );
    }

I would like the first iteration of the loop to ignore the + $row->interval giving me as a result:

10000
96400

I've seen this done with modulus but couldn't manage to make it work here. Anyone have suggestions?

Thanks!

Use + ($i ? $row->interval : 0)

In other words, if $i is zero - first iteration - add 0 instead of $row->interval. This is the ternary operator, (condition ? iftrue : iffalse) which is roughly equivalent to an if/else construction except it can be used amidst a statement.

for ($i = 0; $i <= $row->frequency; $i++) {
    if ($i == 0) {
          $val = strtotime($row->date_1) ;
    } else {
       $val = strtotime($row->date_1) + $row->interval;
    }
    $cal_data[] = array(

        'start' => $val

        );
}