DIv top to bottom listing - php

Question

I need to list half portion of the for loop is to left side and other is in the next is right side.how to solve it?
foreach ( $events as $post ) {
$start_date = tribe_get_start_date( $post, false, 'F d, Y');
$end_date = tribe_get_end_date( $post, false, 'F d, Y');
if($i<=$number){
?>
<div class="col-md-61 leftDiv">
<div class="row1 outerDiv">
<li class="ecs-event">
<span class="duration time">
<span class="tribe-event-date-start"><?php if(!empty($start_date)) { ?> <?php echo $start_date; ?> <?php } ?> <?php if(!empty($end_date) && $start_date != $end_date ) { ?> - <?php echo $end_date; ?> <?php } ?> </span>
</span><span class="duration venue"><em>
at </em><?php echo tribe_get_venue( $post ); ?></span>
<h4 class="entry-title summary"><?php echo $post->post_title; ?>
</h4>
</li>
</div>
</div>
<?php } else {
?>
<div class="col-md-61 rightDiv">
<div class="row1 outerDiv">
<li class="ecs-event">
<span class="duration time">
<span class="tribe-event-date-start"><?php if(!empty($start_date)) { ?> <?php echo $start_date; ?> <?php } ?> <?php if(!empty($end_date) && $start_date != $end_date ) { ?> - <?php echo $end_date; ?> <?php } ?> </span>
</span><span class="duration venue"><em>
at </em><?php echo tribe_get_venue( $post ); ?></span>
<h4 class="entry-title summary"><?php echo $post->post_title; ?>
</h4>
</li>
</div>
</div>
<?php }?>
<?php
} ?>
please help to do that.I mean top to bottom listing as side by side

Answer 1

To point you to the idea you can check for even or odd item numbers to distribute your items.
Here is a generic code:
$even = [];
$odd = [];
foreach(range(1,10) as $value) {
if($value % 2 === 0) {
// even divisable by 2 without rest
$even[] = $value;
continue;
}
$odd[] = $value;
}