adding categories to P2

post-form.php

<select name="drop_cat" id="drop_cat">
    <option value=""><?php echo esc_attr(__('Select a Category', 'p2' )); ?></option>
    <?php
    $args = array (
        'type'           => 'post',
        'child_of'       => 0,
        'parent'         => '',
        'orderby'        => 'name',
        'order'          => 'ASC',
        'hide_empty'     => 0,
        'hierarchical'   => 1,
        'exclude'        => '',
        'include'        => '',
        'number'         => '',
        'taxonomy'       => 'category',
        'pad_counts'     => false
        ); 
     
     $categories =  get_categories($args);
     
     foreach ($categories as $cat) {
        $option = '<option value="'.$cat->category_nicename.'">';
        $option .= $cat->cat_name;
    
    
        // show how many posts there are in each category
        // $option .= ' ('.$cat->category_count.')';
        $option .= '</option>';
        echo $option;
     }
     ?>
</select>