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<strong>Register CPT</strong>
<code>
function mp_cpt_people() {

	$labels = array(
		'name'                  => _x( 'Persons', 'Post Type General Name', 'text_domain' ),
		'singular_name'         => _x( 'Person', 'Post Type Singular Name', 'text_domain' ),
		'menu_name'             => __( 'People', 'text_domain' ),
		'name_admin_bar'        => __( 'People', 'text_domain' ),
		'archives'              => __( 'People Archives', 'text_domain' ),
		'attributes'            => __( 'People Attributes', 'text_domain' ),
		'parent_item_colon'     => __( 'Parent Item:', 'text_domain' ),
		'all_items'             => __( 'All People', 'text_domain' ),
		'add_new_item'          => __( 'Add New People', 'text_domain' ),
		'add_new'               => __( 'Add New', 'text_domain' ),
		'new_item'              => __( 'New People', 'text_domain' ),
		'edit_item'             => __( 'Edit People', 'text_domain' ),
		'update_item'           => __( 'Update People', 'text_domain' ),
		'view_item'             => __( 'View People', 'text_domain' ),
		'view_items'            => __( 'View People', 'text_domain' ),
		'search_items'          => __( 'Search People', 'text_domain' ),
		'not_found'             => __( 'Not found', 'text_domain' ),
		'not_found_in_trash'    => __( 'Not found in Trash', 'text_domain' ),
		'featured_image'        => __( 'Person Photo', 'text_domain' ),
		'set_featured_image'    => __( 'Set person photo', 'text_domain' ),
		'remove_featured_image' => __( 'Remove person photo', 'text_domain' ),
		'use_featured_image'    => __( 'Use as person photo', 'text_domain' ),
		'insert_into_item'      => __( 'Insert into person', 'text_domain' ),
		'uploaded_to_this_item' => __( 'Uploaded to this person', 'text_domain' ),
		'items_list'            => __( 'People list', 'text_domain' ),
		'items_list_navigation' => __( 'People list navigation', 'text_domain' ),
		'filter_items_list'     => __( 'Filter people list', 'text_domain' ),
	);
	$rewrite = array(
		'slug'                  => 'personnel',
		'with_front'            => true,
		'pages'                 => true,
		'feeds'                 => true,
	);
	$args = array(
		'label'                 => __( 'Person', 'text_domain' ),
		'description'           => __( 'Handles the resumes of the persons in CYENS', 'text_domain' ),
		'labels'                => $labels,
		'supports'              => array( 'title', 'editor', 'thumbnail', 'custom-fields' ),
		'taxonomies'            => array( 'department' ),
		'hierarchical'          => false,
		'public'                => true,
		'show_ui'               => true,
		'show_in_menu'          => true,
		'menu_position'         => 5,
		'menu_icon'             => 'dashicons-businessperson',
		'show_in_admin_bar'     => true,
		'show_in_nav_menus'     => true,
		'can_export'            => true,
		'has_archive'           => true,
		'exclude_from_search'   => false,
		'publicly_queryable'    => true,
		'rewrite'               => $rewrite,
		'capability_type'       => 'post',
		'show_in_rest'          => true,
	);
	register_post_type( 'people', $args );

}
add_action( 'init', 'mp_cpt_people', 0 );
</code>

<strong>Register Custom Taxonomy</strong>
<code>
function mp_department() {
  
  $labels = array(
    'name' => _x( 'Selected Department', 'taxonomy general name' ),
    'singular_name' => _x( 'Department', 'taxonomy singular name' ),
    'search_items' =>  __( 'Search Department' ),
    'all_items' => __( 'All Departments' ),
    'parent_item' => __( 'Parent Department' ),
    'parent_item_colon' => __( 'Parent Department:' ),
    'edit_item' => __( 'Edit Department' ), 
    'update_item' => __( 'Update Department' ),
    'add_new_item' => __( 'Add New Department' ),
    'new_item_name' => __( 'New Department Name' ),
    'menu_name' => __( 'Departments' ),
  );    
  
 register_taxonomy('department',['people'], array(
    'hierarchical' => true,
    'labels' => $labels,
    'show_ui' => true,
    'show_in_rest' => true,
    'show_admin_column' => true,
    'query_var' => true,
    'rewrite' => array( 'slug' => 'department' ),
  ));
  
}
add_action( 'init', 'mp_department', 0 );  
</code>

<strong>Register Custom Fields</strong>
<code>
class Person_Details {
	private $config = '{"title":"Person Details","prefix":"person_details_","domain":"person-details","class_name":"Person_Details","post-type":["people"],"context":"normal","priority":"default","cpt":"people","fields":[{"type":"text","label":"Position to CYENS","id":"person_details_position-to-cyens"},{"type":"textarea","label":"Profession","rows":"2","id":"person_details_profession"},{"type":"text","label":"Company","id":"person_details_company"},{"type":"editor","label":"Introduction","rows":"5","teeny":"1","id":"person_details_intro"},{"type":"editor","label":"Email","rows":"1","teeny":"1","id":"person_details_email"},{"type":"editor","label":"LinkedIn","rows":"1","teeny":"1","id":"person_details_linkedin"},{"type":"editor","label":"Website","rows":"1","teeny":"1","id":"person_details_website"},{"type":"editor","label":"Facebook","rows":"1","teeny":"1","id":"person_details_facebook"},{"type":"editor","label":"Instagram","rows":"1","teeny":"1","id":"person_details_instagram"}]}';

	public function __construct() {
		$this->config = json_decode( $this->config, true );
		$this->process_cpts();
		add_action( 'add_meta_boxes', [ $this, 'add_meta_boxes' ] );
		add_action( 'save_post', [ $this, 'save_post' ] );
	}

	public function process_cpts() {
		if ( !empty( $this->config['cpt'] ) ) {
			if ( empty( $this->config['post-type'] ) ) {
				$this->config['post-type'] = [];
			}
			$parts = explode( ',', $this->config['cpt'] );
			$parts = array_map( 'trim', $parts );
			$this->config['post-type'] = array_merge( $this->config['post-type'], $parts );
		}
	}

	public function add_meta_boxes() {
		foreach ( $this->config['post-type'] as $screen ) {
			add_meta_box(
				sanitize_title( $this->config['title'] ),
				$this->config['title'],
				[ $this, 'add_meta_box_callback' ],
				$screen,
				$this->config['context'],
				$this->config['priority']
			);
		}
	}

	public function save_post( $post_id ) {
		foreach ( $this->config['fields'] as $field ) {
			switch ( $field['type'] ) {
				case 'editor':
					if ( isset( $_POST[ $field['id'] ] ) ) {
						$sanitized = wp_filter_post_kses( $_POST[ $field['id'] ] );
						update_post_meta( $post_id, $field['id'], $sanitized );
					}
					break;
				default:
					if ( isset( $_POST[ $field['id'] ] ) ) {
						$sanitized = sanitize_text_field( $_POST[ $field['id'] ] );
						update_post_meta( $post_id, $field['id'], $sanitized );
					}
			}
		}
	}

	public function add_meta_box_callback() {
		$this->fields_table();
	}

	private function fields_table() {
		?><table class="form-table" role="presentation">
			<tbody><?php
				foreach ( $this->config['fields'] as $field ) {
					?><tr>
						<th scope="row"><?php $this->label( $field ); ?></th>
						<td><?php $this->field( $field ); ?></td>
					</tr><?php
				}
			?></tbody>
		</table><?php
	}

	private function label( $field ) {
		switch ( $field['type'] ) {
			case 'editor':
				echo '<div class="">' . $field['label'] . '</div>';
				break;
			default:
				printf(
					'<label class="" for="%s">%s</label>',
					$field['id'], $field['label']
				);
		}
	}

	private function field( $field ) {
		switch ( $field['type'] ) {
			case 'editor':
				$this->editor( $field );
				break;
			case 'textarea':
				$this->textarea( $field );
				break;
			default:
				$this->input( $field );
		}
	}

	private function editor( $field ) {
		wp_editor( $this->value( $field ), $field['id'], [
			'wpautop' => isset( $field['wpautop'] ) ? true : false,
			'media_buttons' => isset( $field['media-buttons'] ) ? true : false,
			'textarea_name' => $field['id'],
			'textarea_rows' => isset( $field['rows'] ) ? isset( $field['rows'] ) : 20,
			'teeny' => isset( $field['teeny'] ) ? true : false
		] );
	}

	private function input( $field ) {
		printf(
			'<input class="regular-text %s" id="%s" name="%s" %s type="%s" value="%s">',
			isset( $field['class'] ) ? $field['class'] : '',
			$field['id'], $field['id'],
			isset( $field['pattern'] ) ? "pattern='{$field['pattern']}'" : '',
			$field['type'],
			$this->value( $field )
		);
	}

	private function textarea( $field ) {
		printf(
			'<textarea class="regular-text" id="%s" name="%s" rows="%d">%s</textarea>',
			$field['id'], $field['id'],
			isset( $field['rows'] ) ? $field['rows'] : 5,
			$this->value( $field )
		);
	}

	private function value( $field ) {
		global $post;
		if ( metadata_exists( 'post', $post->ID, $field['id'] ) ) {
			$value = get_post_meta( $post->ID, $field['id'], true );
		} else if ( isset( $field['default'] ) ) {
			$value = $field['default'];
		} else {
			return '';
		}
		return str_replace( '\u0027', "'", $value );
	}

}
new Person_Details;
</code>