Preview:
<?php
function create_testimonial()
{
    $labels = array(
        'name' => _x('Testimonials', 'Post Type General Name', 'textdomain'),
        'singular_name' => _x('Testimonial ', 'Post Type Singular Name', 'textdomain'),
        'menu_name' => _x('Testimonials', 'Admin Menu text', 'textdomain'),
        'name_admin_bar' => _x('Testimonials ', 'Add New on Toolbar', 'textdomain'),
        'archives' => __('Testimonials  Archives', 'textdomain'),
        'attributes' => __('Testimonials  Attributes', 'textdomain'),
        'parent_item_colon' => __('Parent Testimonials :', 'textdomain'),
        'all_items' => __('All Testimonials', 'textdomain'),
        'add_new_item' => __('Add New Testimonials ', 'textdomain'),
        'add_new' => __('Add New', 'textdomain'),
        'new_item' => __('New Testimonials ', 'textdomain'),
        'edit_item' => __('Edit Testimonials ', 'textdomain'),
        'update_item' => __('Update Testimonials ', 'textdomain'),
        'view_item' => __('View Testimonials ', 'textdomain'),
        'view_items' => __('View Testimonials', 'textdomain'),
        'search_items' => __('Search Testimonials ', 'textdomain'),
        'not_found' => __('Not found', 'textdomain'),
        'not_found_in_trash' => __('Not found in Trash', 'textdomain'),
        'featured_image' => __('Featured Image', 'textdomain'),
        'set_featured_image' => __('Set featured image', 'textdomain'),
        'remove_featured_image' => __('Remove featured image', 'textdomain'),
        'use_featured_image' => __('Use as featured image', 'textdomain'),
        'insert_into_item' => __('Insert into Testimonials ', 'textdomain'),
        'uploaded_to_this_item' => __('Uploaded to this Testimonials ', 'textdomain'),
        'items_list' => __('Testimonials list', 'textdomain'),
        'items_list_navigation' => __('Testimonials list navigation', 'textdomain'),
        'filter_items_list' => __('Filter Testimonials list', 'textdomain'),
    );
    $rewrite = array(
        'slug' => 'testimonial',
        'with_front' => true,
        'pages' => true,
        'feeds' => true,
    );
    $args = array(
        'label' => __('Testimonial ', 'textdomain'),
        'description' => __('', 'textdomain'),
        'labels' => $labels,
        'menu_icon' => 'dashicons-format-chat',
        'supports' => array('title', 'editor', 'excerpt', 'thumbnail', 'page-attributes', 'post-formats', 'custom-fields'),
        'taxonomies' => array(),
        'public' => true,
        'show_ui' => true,
        'show_in_menu' => true,
        'menu_position' => 5,
        'show_in_admin_bar' => true,
        'show_in_nav_menus' => true,
        'can_export' => true,
        'has_archive' => true,
        'hierarchical' => true,
        'exclude_from_search' => true,
        'show_in_rest' => true,
        'publicly_queryable' => true,
        'capability_type' => 'post',
        'rewrite' => $rewrite,
    );
    register_post_type('testimonial', $args);
    register_taxonomy('testimonial_category', 'testimonial', array('hierarchical' => true, 'label' => 'Category', 'query_var' => true, 'rewrite' => array('slug' => 'testimonial-category')));
}
add_action('init', 'create_testimonial', 0);

?>

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