identical postLink

index.ctp

<?php $this->start('myblock'); ?>
<li><?= $this->Form->postLink(__('Postlink index'), ['action' => 'index']) ?> </li>
<?php $this->end(); ?>

<nav class="large-3 medium-4 columns" id="actions-sidebar">
    <ul class="side-nav">
        <li class="heading"><?= __('Actions') ?></li>
        <li><?= $this->Html->link(__('New User'), ['action' => 'add']) ?></li>
        <?php echo $this->fetch('myblock'); ?>
        <?php echo $this->fetch('myblock'); ?>

    </ul>
</nav>