wpdk-screen-help.php

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<?php

class WPDKScreenHelp {

  public $currentScreen;

  private $tabs = array();

  public function __construct()
  {
    $this->currentScreen = get_current_screen();
  }

  public function tabs( $tabs = array() )
  {
    die( __METHOD__ . ' must be override in your subclass' );
  }

  public function display()
  {
    // Merging
    $this->tabs = array_merge( $this->tabs, (array)$this->tabs() );

    // Add the tabs
    foreach ( $this->tabs as $title => $callable_content ) {
      $this->addTab( $title, $callable_content );
    }

    // Add the sidebar if exists
    $sidebar = $this->sidebar();
    if ( !empty( $sidebar ) ) {
      $this->currentScreen->set_help_sidebar( $sidebar );
    }
  }

  public function addTab( $title, $callable_content )
  {
    // If $callable_content is empty exit
    if ( empty( $callable_content ) ) {
      return;
    }

    // Store in global
    $this->tabs[$title] = $callable_content;

    $help_tab = array(
      'id'    => sanitize_key( $title ),
      'title' => $title,
    );

    if ( is_string( $callable_content ) && !is_callable( $callable_content ) ) {
      $help_tab['content'] = $callable_content;
    }

    if ( is_callable( $callable_content ) ) {
      $help_tab['callback'] = $callable_content;
    }

    $this->currentScreen->add_help_tab( $help_tab );
  }

  public function sidebar()
  {
    // You can override if you will support a sidebar content
    return '';
  }

}