<form method="POST">
    <h3>Editing: class-wp-screen.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php
/**
 * Screen API: WP_Screen class
 *
 * @package WordPress
 * @subpackage Administration
 * @since 4.4.0
 */

/**
 * Core class used to implement an admin screen API.
 *
 * @since 3.3.0
 */
#[AllowDynamicProperties]
final class WP_Screen {
	/**
	 * Any action associated with the screen.
	 *
	 * 'add' for *-add.php and *-new.php screens. Empty otherwise.
	 *
	 * @since 3.3.0
	 * @var string
	 */
	public $action;

	/**
	 * The base type of the screen.
	 *
	 * This is typically the same as `$id` but with any post types and taxonomies stripped.
	 * For example, for an `$id` of 'edit-post' the base is 'edit'.
	 *
	 * @since 3.3.0
	 * @var string
	 */
	public $base;

	/**
	 * The number of columns to display. Access with get_columns().
	 *
	 * @since 3.4.0
	 * @var int
	 */
	private $columns = 0;

	/**
	 * The unique ID of the screen.
	 *
	 * @since 3.3.0
	 * @var string
	 */
	public $id;

	/**
	 * Which admin the screen is in. network | user | site | false
	 *
	 * @since 3.5.0
	 * @var string
	 */
	protected $in_admin;

	/**
	 * Whether the screen is in the network admin.
	 *
	 * Deprecated. Use in_admin() instead.
	 *
	 * @since 3.3.0
	 * @deprecated 3.5.0
	 * @var bool
	 */
	public $is_network;

	/**
	 * Whether the screen is in the user admin.
	 *
	 * Deprecated. Use in_admin() instead.
	 *
	 * @since 3.3.0
	 * @deprecated 3.5.0
	 * @var bool
	 */
	public $is_user;

	/**
	 * The base menu parent.
	 *
	 * This is derived from `$parent_file` by removing the query string and any .php extension.
	 * `$parent_file` values of 'edit.php?post_type=page' and 'edit.php?post_type=post'
	 * have a `$parent_base` of 'edit'.
	 *
	 * @since 3.3.0
	 * @var string|null
	 */
	public $parent_base;

	/**
	 * The parent_file for the screen per the admin menu system.
	 *
	 * Some `$parent_file` values are 'edit.php?post_type=page', 'edit.php', and 'options-general.php'.
	 *
	 * @since 3.3.0
	 * @var string|null
	 */
	public $parent_file;

	/**
	 * The post type associated with the screen, if any.
	 *
	 * The 'edit.php?post_type=page' screen has a post type of 'page'.
	 * The 'edit-tags.php?taxonomy=$taxonomy&amp;post_type=page' screen has a post type of 'page'.
	 *
	 * @since 3.3.0
	 * @var string
	 */
	public $post_type;

	/**
	 * The taxonomy associated with the screen, if any.
	 *
	 * The 'edit-tags.php?taxonomy=category' screen has a taxonomy of 'category'.
	 *
	 * @since 3.3.0
	 * @var string
	 */
	public $taxonomy;

	/**
	 * The help tab data associated with the screen, if any.
	 *
	 * @since 3.3.0
	 * @var array
	 */
	private $_help_tabs = array();

	/**
	 * The help sidebar data associated with screen, if any.
	 *
	 * @since 3.3.0
	 * @var string
	 */
	private $_help_sidebar = '';

	/**
	 * The accessible hidden headings and text associated with the screen, if any.
	 *
	 * @since 4.4.0
	 * @var string[]
	 */
	private $_screen_reader_content = array();

	/**
	 * Stores old string-based help.
	 *
	 * @var array
	 */
	private static $_old_compat_help = array();

	/**
	 * The screen options associated with screen, if any.
	 *
	 * @since 3.3.0
	 * @var array
	 */
	private $_options = array();

	/**
	 * The screen object registry.
	 *
	 * @since 3.3.0
	 *
	 * @var array
	 */
	private static $_registry = array();

	/**
	 * Stores the result of the public show_screen_options function.
	 *
	 * @since 3.3.0
	 * @var bool
	 */
	private $_show_screen_options;

	/**
	 * Stores the 'screen_settings' section of screen options.
	 *
	 * @since 3.3.0
	 * @var string
	 */
	private $_screen_settings;

	/**
	 * Whether the screen is using the block editor.
	 *
	 * @since 5.0.0
	 * @var bool
	 */
	public $is_block_editor = false;

	/**
	 * Fetches a screen object.
	 *
	 * @since 3.3.0
	 *
	 * @global string $hook_suffix
	 *
	 * @param string|WP_Screen $hook_name Optional. The hook name (also known as the hook suffix) used to determine the screen.
	 *                                    Defaults to the current $hook_suffix global.
	 * @return WP_Screen Screen object.
	 */
	public static function get( $hook_name = '' ) {
		if ( $hook_name instanceof WP_Screen ) {
			return $hook_name;
		}

		$id              = '';
		$post_type       = null;
		$taxonomy        = null;
		$in_admin        = false;
		$action          = '';
		$is_block_editor = false;

		if ( $hook_name ) {
			$id = $hook_name;
		} elseif ( ! empty( $GLOBALS['hook_suffix'] ) ) {
			$id = $GLOBALS['hook_suffix'];
		}

		// For those pesky meta boxes.
		if ( $hook_name &amp;&amp; post_type_exists( $hook_name ) ) {
			$post_type = $id;
			$id        = 'post'; // Changes later. Ends up being $base.
		} else {
			if ( str_ends_with( $id, '.php' ) ) {
				$id = substr( $id, 0, -4 );
			}

			if ( in_array( $id, array( 'post-new', 'link-add', 'media-new', 'user-new' ), true ) ) {
				$id     = substr( $id, 0, -4 );
				$action = 'add';
			}
		}

		if ( ! $post_type &amp;&amp; $hook_name ) {
			if ( str_ends_with( $id, '-network' ) ) {
				$id       = substr( $id, 0, -8 );
				$in_admin = 'network';
			} elseif ( str_ends_with( $id, '-user' ) ) {
				$id       = substr( $id, 0, -5 );
				$in_admin = 'user';
			}

			$id = sanitize_key( $id );
			if ( 'edit-comments' !== $id &amp;&amp; 'edit-tags' !== $id &amp;&amp; str_starts_with( $id, 'edit-' ) ) {
				$maybe = substr( $id, 5 );
				if ( taxonomy_exists( $maybe ) ) {
					$id       = 'edit-tags';
					$taxonomy = $maybe;
				} elseif ( post_type_exists( $maybe ) ) {
					$id        = 'edit';
					$post_type = $maybe;
				}
			}

			if ( ! $in_admin ) {
				$in_admin = 'site';
			}
		} else {
			if ( defined( 'WP_NETWORK_ADMIN' ) &amp;&amp; WP_NETWORK_ADMIN ) {
				$in_admin = 'network';
			} elseif ( defined( 'WP_USER_ADMIN' ) &amp;&amp; WP_USER_ADMIN ) {
				$in_admin = 'user';
			} else {
				$in_admin = 'site';
			}
		}

		if ( 'index' === $id ) {
			$id = 'dashboard';
		} elseif ( 'front' === $id ) {
			$in_admin = false;
		}

		$base = $id;

		// If this is the current screen, see if we can be more accurate for post types and taxonomies.
		if ( ! $hook_name ) {
			if ( isset( $_REQUEST['post_type'] ) ) {
				$post_type = post_type_exists( $_REQUEST['post_type'] ) ? $_REQUEST['post_type'] : false;
			}
			if ( isset( $_REQUEST['taxonomy'] ) ) {
				$taxonomy = taxonomy_exists( $_REQUEST['taxonomy'] ) ? $_REQUEST['taxonomy'] : false;
			}

			switch ( $base ) {
				case 'post':
					if ( isset( $_GET['post'] ) &amp;&amp; isset( $_POST['post_ID'] ) &amp;&amp; (int) $_GET['post'] !== (int) $_POST['post_ID'] ) {
						wp_die( __( 'A post ID mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
					} elseif ( isset( $_GET['post'] ) ) {
						$post_id = (int) $_GET['post'];
					} elseif ( isset( $_POST['post_ID'] ) ) {
						$post_id = (int) $_POST['post_ID'];
					} else {
						$post_id = 0;
					}

					if ( $post_id ) {
						$post = get_post( $post_id );
						if ( $post ) {
							$post_type = $post-&gt;post_type;

							/** This filter is documented in wp-admin/post.php */
							$replace_editor = apply_filters( 'replace_editor', false, $post );

							if ( ! $replace_editor ) {
								$is_block_editor = use_block_editor_for_post( $post );
							}
						}
					}
					break;
				case 'edit-tags':
				case 'term':
					if ( null === $post_type &amp;&amp; is_object_in_taxonomy( 'post', $taxonomy ? $taxonomy : 'post_tag' ) ) {
						$post_type = 'post';
					}
					break;
				case 'upload':
					$post_type = 'attachment';
					break;
			}
		}

		switch ( $base ) {
			case 'post':
				if ( null === $post_type ) {
					$post_type = 'post';
				}

				// When creating a new post, use the default block editor support value for the post type.
				if ( empty( $post_id ) ) {
					$is_block_editor = use_block_editor_for_post_type( $post_type );
				}

				$id = $post_type;
				break;
			case 'edit':
				if ( null === $post_type ) {
					$post_type = 'post';
				}
				$id .= '-' . $post_type;
				break;
			case 'edit-tags':
			case 'term':
				if ( null === $taxonomy ) {
					$taxonomy = 'post_tag';
				}
				// The edit-tags ID does not contain the post type. Look for it in the request.
				if ( null === $post_type ) {
					$post_type = 'post';
					if ( isset( $_REQUEST['post_type'] ) &amp;&amp; post_type_exists( $_REQUEST['post_type'] ) ) {
						$post_type = $_REQUEST['post_type'];
					}
				}

				$id = 'edit-' . $taxonomy;
				break;
		}

		if ( 'network' === $in_admin ) {
			$id   .= '-network';
			$base .= '-network';
		} elseif ( 'user' === $in_admin ) {
			$id   .= '-user';
			$base .= '-user';
		}

		if ( isset( self::$_registry[ $id ] ) ) {
			$screen = self::$_registry[ $id ];
			if ( get_current_screen() === $screen ) {
				return $screen;
			}
		} else {
			$screen     = new self();
			$screen-&gt;id = $id;
		}

		$screen-&gt;base            = $base;
		$screen-&gt;action          = $action;
		$screen-&gt;post_type       = (string) $post_type;
		$screen-&gt;taxonomy        = (string) $taxonomy;
		$screen-&gt;is_user         = ( 'user' === $in_admin );
		$screen-&gt;is_network      = ( 'network' === $in_admin );
		$screen-&gt;in_admin        = $in_admin;
		$screen-&gt;is_block_editor = $is_block_editor;

		self::$_registry[ $id ] = $screen;

		return $screen;
	}

	/**
	 * Makes the screen object the current screen.
	 *
	 * @see set_current_screen()
	 * @since 3.3.0
	 *
	 * @global WP_Screen $current_screen WordPress current screen object.
	 * @global string    $typenow        The post type of the current screen.
	 * @global string    $taxnow         The taxonomy of the current screen.
	 */
	public function set_current_screen() {
		global $current_screen, $taxnow, $typenow;

		$current_screen = $this;
		$typenow        = $this-&gt;post_type;
		$taxnow         = $this-&gt;taxonomy;

		/**
		 * Fires after the current screen has been set.
		 *
		 * @since 3.0.0
		 *
		 * @param WP_Screen $current_screen Current WP_Screen object.
		 */
		do_action( 'current_screen', $current_screen );
	}

	/**
	 * Constructor
	 *
	 * @since 3.3.0
	 */
	private function __construct() {}

	/**
	 * Indicates whether the screen is in a particular admin.
	 *
	 * @since 3.5.0
	 *
	 * @param string $admin The admin to check against (network | user | site).
	 *                      If empty any of the three admins will result in true.
	 * @return bool True if the screen is in the indicated admin, false otherwise.
	 */
	public function in_admin( $admin = null ) {
		if ( empty( $admin ) ) {
			return (bool) $this-&gt;in_admin;
		}

		return ( $admin === $this-&gt;in_admin );
	}

	/**
	 * Sets or returns whether the block editor is loading on the current screen.
	 *
	 * @since 5.0.0
	 *
	 * @param bool $set Optional. Sets whether the block editor is loading on the current screen or not.
	 * @return bool True if the block editor is being loaded, false otherwise.
	 */
	public function is_block_editor( $set = null ) {
		if ( null !== $set ) {
			$this-&gt;is_block_editor = (bool) $set;
		}

		return $this-&gt;is_block_editor;
	}

	/**
	 * Sets the old string-based contextual help for the screen for backward compatibility.
	 *
	 * @since 3.3.0
	 *
	 * @param WP_Screen $screen A screen object.
	 * @param string    $help   Help text.
	 */
	public static function add_old_compat_help( $screen, $help ) {
		self::$_old_compat_help[ $screen-&gt;id ] = $help;
	}

	/**
	 * Sets the parent information for the screen.
	 *
	 * This is called in admin-header.php after the menu parent for the screen has been determined.
	 *
	 * @since 3.3.0
	 *
	 * @param string $parent_file The parent file of the screen. Typically the $parent_file global.
	 */
	public function set_parentage( $parent_file ) {
		$this-&gt;parent_file         = $parent_file;
		list( $this-&gt;parent_base ) = explode( '?', $parent_file );
		$this-&gt;parent_base         = str_replace( '.php', '', $this-&gt;parent_base );
	}

	/**
	 * Adds an option for the screen.
	 *
	 * Call this in template files after admin.php is loaded and before admin-header.php is loaded
	 * to add screen options.
	 *
	 * @since 3.3.0
	 *
	 * @param string $option Option ID.
	 * @param mixed  $args   Option-dependent arguments.
	 */
	public function add_option( $option, $args = array() ) {
		$this-&gt;_options[ $option ] = $args;
	}

	/**
	 * Removes an option from the screen.
	 *
	 * @since 3.8.0
	 *
	 * @param string $option Option ID.
	 */
	public function remove_option( $option ) {
		unset( $this-&gt;_options[ $option ] );
	}

	/**
	 * Removes all options from the screen.
	 *
	 * @since 3.8.0
	 */
	public function remove_options() {
		$this-&gt;_options = array();
	}

	/**
	 * Gets the options registered for the screen.
	 *
	 * @since 3.8.0
	 *
	 * @return array Options with arguments.
	 */
	public function get_options() {
		return $this-&gt;_options;
	}

	/**
	 * Gets the arguments for an option for the screen.
	 *
	 * @since 3.3.0
	 *
	 * @param string       $option Option name.
	 * @param string|false $key    Optional. Specific array key for when the option is an array.
	 *                             Default false.
	 * @return string The option value if set, null otherwise.
	 */
	public function get_option( $option, $key = false ) {
		if ( ! isset( $this-&gt;_options[ $option ] ) ) {
			return null;
		}
		if ( $key ) {
			if ( isset( $this-&gt;_options[ $option ][ $key ] ) ) {
				return $this-&gt;_options[ $option ][ $key ];
			}
			return null;
		}
		return $this-&gt;_options[ $option ];
	}

	/**
	 * Gets the help tabs registered for the screen.
	 *
	 * @since 3.4.0
	 * @since 4.4.0 Help tabs are ordered by their priority.
	 *
	 * @return array Help tabs with arguments.
	 */
	public function get_help_tabs() {
		$help_tabs = $this-&gt;_help_tabs;

		$priorities = array();
		foreach ( $help_tabs as $help_tab ) {
			if ( isset( $priorities[ $help_tab['priority'] ] ) ) {
				$priorities[ $help_tab['priority'] ][] = $help_tab;
			} else {
				$priorities[ $help_tab['priority'] ] = array( $help_tab );
			}
		}

		ksort( $priorities );

		$sorted = array();
		foreach ( $priorities as $list ) {
			foreach ( $list as $tab ) {
				$sorted[ $tab['id'] ] = $tab;
			}
		}

		return $sorted;
	}

	/**
	 * Gets the arguments for a help tab.
	 *
	 * @since 3.4.0
	 *
	 * @param string $id Help Tab ID.
	 * @return array Help tab arguments.
	 */
	public function get_help_tab( $id ) {
		if ( ! isset( $this-&gt;_help_tabs[ $id ] ) ) {
			return null;
		}
		return $this-&gt;_help_tabs[ $id ];
	}

	/**
	 * Adds a help tab to the contextual help for the screen.
	 *
	 * Call this on the `load-$pagenow` hook for the relevant screen,
	 * or fetch the `$current_screen` object, or use get_current_screen()
	 * and then call the method from the object.
	 *
	 * You may need to filter `$current_screen` using an if or switch statement
	 * to prevent new help tabs from being added to ALL admin screens.
	 *
	 * @since 3.3.0
	 * @since 4.4.0 The `$priority` argument was added.
	 *
	 * @param array $args {
	 *     Array of arguments used to display the help tab.
	 *
	 *     @type string   $title    Title for the tab. Default false.
	 *     @type string   $id       Tab ID. Must be HTML-safe and should be unique for this menu.
	 *                              It is NOT allowed to contain any empty spaces. Default false.
	 *     @type string   $content  Optional. Help tab content in plain text or HTML. Default empty string.
	 *     @type callable $callback Optional. A callback to generate the tab content. Default false.
	 *     @type int      $priority Optional. The priority of the tab, used for ordering. Default 10.
	 * }
	 */
	public function add_help_tab( $args ) {
		$defaults = array(
			'title'    =&gt; false,
			'id'       =&gt; false,
			'content'  =&gt; '',
			'callback' =&gt; false,
			'priority' =&gt; 10,
		);
		$args     = wp_parse_args( $args, $defaults );

		$args['id'] = sanitize_html_class( $args['id'] );

		// Ensure we have an ID and title.
		if ( ! $args['id'] || ! $args['title'] ) {
			return;
		}

		// Allows for overriding an existing tab with that ID.
		$this-&gt;_help_tabs[ $args['id'] ] = $args;
	}

	/**
	 * Removes a help tab from the contextual help for the screen.
	 *
	 * @since 3.3.0
	 *
	 * @param string $id The help tab ID.
	 */
	public function remove_help_tab( $id ) {
		unset( $this-&gt;_help_tabs[ $id ] );
	}

	/**
	 * Removes all help tabs from the contextual help for the screen.
	 *
	 * @since 3.3.0
	 */
	public function remove_help_tabs() {
		$this-&gt;_help_tabs = array();
	}

	/**
	 * Gets the content from a contextual help sidebar.
	 *
	 * @since 3.4.0
	 *
	 * @return string Contents of the help sidebar.
	 */
	public function get_help_sidebar() {
		return $this-&gt;_help_sidebar;
	}

	/**
	 * Adds a sidebar to the contextual help for the screen.
	 *
	 * Call this in template files after admin.php is loaded and before admin-header.php is loaded
	 * to add a sidebar to the contextual help.
	 *
	 * @since 3.3.0
	 *
	 * @param string $content Sidebar content in plain text or HTML.
	 */
	public function set_help_sidebar( $content ) {
		$this-&gt;_help_sidebar = $content;
	}

	/**
	 * Gets the number of layout columns the user has selected.
	 *
	 * The layout_columns option controls the max number and default number of
	 * columns. This method returns the number of columns within that range selected
	 * by the user via Screen Options. If no selection has been made, the default
	 * provisioned in layout_columns is returned. If the screen does not support
	 * selecting the number of layout columns, 0 is returned.
	 *
	 * @since 3.4.0
	 *
	 * @return int Number of columns to display.
	 */
	public function get_columns() {
		return $this-&gt;columns;
	}

	/**
	 * Gets the accessible hidden headings and text used in the screen.
	 *
	 * @since 4.4.0
	 *
	 * @see set_screen_reader_content() For more information on the array format.
	 *
	 * @return string[] An associative array of screen reader text strings.
	 */
	public function get_screen_reader_content() {
		return $this-&gt;_screen_reader_content;
	}

	/**
	 * Gets a screen reader text string.
	 *
	 * @since 4.4.0
	 *
	 * @param string $key Screen reader text array named key.
	 * @return string Screen reader text string.
	 */
	public function get_screen_reader_text( $key ) {
		if ( ! isset( $this-&gt;_screen_reader_content[ $key ] ) ) {
			return null;
		}
		return $this-&gt;_screen_reader_content[ $key ];
	}

	/**
	 * Adds accessible hidden headings and text for the screen.
	 *
	 * @since 4.4.0
	 *
	 * @param array $content {
	 *     An associative array of screen reader text strings.
	 *
	 *     @type string $heading_views      Screen reader text for the filter links heading.
	 *                                      Default 'Filter items list'.
	 *     @type string $heading_pagination Screen reader text for the pagination heading.
	 *                                      Default 'Items list navigation'.
	 *     @type string $heading_list       Screen reader text for the items list heading.
	 *                                      Default 'Items list'.
	 * }
	 */
	public function set_screen_reader_content( $content = array() ) {
		$defaults = array(
			'heading_views'      =&gt; __( 'Filter items list' ),
			'heading_pagination' =&gt; __( 'Items list navigation' ),
			'heading_list'       =&gt; __( 'Items list' ),
		);
		$content  = wp_parse_args( $content, $defaults );

		$this-&gt;_screen_reader_content = $content;
	}

	/**
	 * Removes all the accessible hidden headings and text for the screen.
	 *
	 * @since 4.4.0
	 */
	public function remove_screen_reader_content() {
		$this-&gt;_screen_reader_content = array();
	}

	/**
	 * Renders the screen's help section.
	 *
	 * This will trigger the deprecated filters for backward compatibility.
	 *
	 * @since 3.3.0
	 *
	 * @global string $screen_layout_columns
	 */
	public function render_screen_meta() {

		/**
		 * Filters the legacy contextual help list.
		 *
		 * @since 2.7.0
		 * @deprecated 3.3.0 Use {@see get_current_screen()-&gt;add_help_tab()} or
		 *                   {@see get_current_screen()-&gt;remove_help_tab()} instead.
		 *
		 * @param array     $old_compat_help Old contextual help.
		 * @param WP_Screen $screen          Current WP_Screen instance.
		 */
		self::$_old_compat_help = apply_filters_deprecated(
			'contextual_help_list',
			array( self::$_old_compat_help, $this ),
			'3.3.0',
			'get_current_screen()-&gt;add_help_tab(), get_current_screen()-&gt;remove_help_tab()'
		);

		$old_help = isset( self::$_old_compat_help[ $this-&gt;id ] ) ? self::$_old_compat_help[ $this-&gt;id ] : '';

		/**
		 * Filters the legacy contextual help text.
		 *
		 * @since 2.7.0
		 * @deprecated 3.3.0 Use {@see get_current_screen()-&gt;add_help_tab()} or
		 *                   {@see get_current_screen()-&gt;remove_help_tab()} instead.
		 *
		 * @param string    $old_help  Help text that appears on the screen.
		 * @param string    $screen_id Screen ID.
		 * @param WP_Screen $screen    Current WP_Screen instance.
		 */
		$old_help = apply_filters_deprecated(
			'contextual_help',
			array( $old_help, $this-&gt;id, $this ),
			'3.3.0',
			'get_current_screen()-&gt;add_help_tab(), get_current_screen()-&gt;remove_help_tab()'
		);

		// Default help only if there is no old-style block of text and no new-style help tabs.
		if ( empty( $old_help ) &amp;&amp; ! $this-&gt;get_help_tabs() ) {

			/**
			 * Filters the default legacy contextual help text.
			 *
			 * @since 2.8.0
			 * @deprecated 3.3.0 Use {@see get_current_screen()-&gt;add_help_tab()} or
			 *                   {@see get_current_screen()-&gt;remove_help_tab()} instead.
			 *
			 * @param string $old_help_default Default contextual help text.
			 */
			$default_help = apply_filters_deprecated(
				'default_contextual_help',
				array( '' ),
				'3.3.0',
				'get_current_screen()-&gt;add_help_tab(), get_current_screen()-&gt;remove_help_tab()'
			);
			if ( $default_help ) {
				$old_help = '&lt;p&gt;' . $default_help . '&lt;/p&gt;';
			}
		}

		if ( $old_help ) {
			$this-&gt;add_help_tab(
				array(
					'id'      =&gt; 'old-contextual-help',
					'title'   =&gt; __( 'Overview' ),
					'content' =&gt; $old_help,
				)
			);
		}

		$help_sidebar = $this-&gt;get_help_sidebar();

		$help_class = 'hidden';
		if ( ! $help_sidebar ) {
			$help_class .= ' no-sidebar';
		}

		// Time to render!
		?&gt;
		&lt;div id=&quot;screen-meta&quot; class=&quot;metabox-prefs&quot;&gt;

			&lt;div id=&quot;contextual-help-wrap&quot; class=&quot;&lt;?php echo esc_attr( $help_class ); ?&gt;&quot; tabindex=&quot;-1&quot; aria-label=&quot;&lt;?php esc_attr_e( 'Contextual Help Tab' ); ?&gt;&quot;&gt;
				&lt;div id=&quot;contextual-help-back&quot;&gt;&lt;/div&gt;
				&lt;div id=&quot;contextual-help-columns&quot;&gt;
					&lt;div class=&quot;contextual-help-tabs&quot;&gt;
						&lt;ul&gt;
						&lt;?php
						$class = ' class=&quot;active&quot;';
						foreach ( $this-&gt;get_help_tabs() as $tab ) :
							$link_id  = &quot;tab-link-{$tab['id']}&quot;;
							$panel_id = &quot;tab-panel-{$tab['id']}&quot;;
							?&gt;

							&lt;li id=&quot;&lt;?php echo esc_attr( $link_id ); ?&gt;&quot;&lt;?php echo $class; ?&gt;&gt;
								&lt;a href=&quot;&lt;?php echo esc_url( &quot;#$panel_id&quot; ); ?&gt;&quot; aria-controls=&quot;&lt;?php echo esc_attr( $panel_id ); ?&gt;&quot;&gt;
									&lt;?php echo esc_html( $tab['title'] ); ?&gt;
								&lt;/a&gt;
							&lt;/li&gt;
							&lt;?php
							$class = '';
						endforeach;
						?&gt;
						&lt;/ul&gt;
					&lt;/div&gt;

					&lt;?php if ( $help_sidebar ) : ?&gt;
					&lt;div class=&quot;contextual-help-sidebar&quot;&gt;
						&lt;?php echo $help_sidebar; ?&gt;
					&lt;/div&gt;
					&lt;?php endif; ?&gt;

					&lt;div class=&quot;contextual-help-tabs-wrap&quot;&gt;
						&lt;?php
						$classes = 'help-tab-content active';
						foreach ( $this-&gt;get_help_tabs() as $tab ) :
							$panel_id = &quot;tab-panel-{$tab['id']}&quot;;
							?&gt;

							&lt;div id=&quot;&lt;?php echo esc_attr( $panel_id ); ?&gt;&quot; class=&quot;&lt;?php echo $classes; ?&gt;&quot;&gt;
								&lt;?php
								// Print tab content.
								echo $tab['content'];

								// If it exists, fire tab callback.
								if ( ! empty( $tab['callback'] ) ) {
									call_user_func_array( $tab['callback'], array( $this, $tab ) );
								}
								?&gt;
							&lt;/div&gt;
							&lt;?php
							$classes = 'help-tab-content';
						endforeach;
						?&gt;
					&lt;/div&gt;
				&lt;/div&gt;
			&lt;/div&gt;
		&lt;?php
		// Setup layout columns.

		/**
		 * Filters the array of screen layout columns.
		 *
		 * This hook provides back-compat for plugins using the back-compat
		 * Filters instead of add_screen_option().
		 *
		 * @since 2.8.0
		 *
		 * @param array     $empty_columns Empty array.
		 * @param string    $screen_id     Screen ID.
		 * @param WP_Screen $screen        Current WP_Screen instance.
		 */
		$columns = apply_filters( 'screen_layout_columns', array(), $this-&gt;id, $this );

		if ( ! empty( $columns ) &amp;&amp; isset( $columns[ $this-&gt;id ] ) ) {
			$this-&gt;add_option( 'layout_columns', array( 'max' =&gt; $columns[ $this-&gt;id ] ) );
		}

		if ( $this-&gt;get_option( 'layout_columns' ) ) {
			$this-&gt;columns = (int) get_user_option( &quot;screen_layout_$this-&gt;id&quot; );

			if ( ! $this-&gt;columns &amp;&amp; $this-&gt;get_option( 'layout_columns', 'default' ) ) {
				$this-&gt;columns = $this-&gt;get_option( 'layout_columns', 'default' );
			}
		}
		$GLOBALS['screen_layout_columns'] = $this-&gt;columns; // Set the global for back-compat.

		// Add screen options.
		if ( $this-&gt;show_screen_options() ) {
			$this-&gt;render_screen_options();
		}
		?&gt;
		&lt;/div&gt;
		&lt;?php
		if ( ! $this-&gt;get_help_tabs() &amp;&amp; ! $this-&gt;show_screen_options() ) {
			return;
		}
		?&gt;
		&lt;div id=&quot;screen-meta-links&quot;&gt;
		&lt;?php if ( $this-&gt;show_screen_options() ) : ?&gt;
			&lt;div id=&quot;screen-options-link-wrap&quot; class=&quot;hide-if-no-js screen-meta-toggle&quot;&gt;
			&lt;button type=&quot;button&quot; id=&quot;show-settings-link&quot; class=&quot;button show-settings&quot; aria-controls=&quot;screen-options-wrap&quot; aria-expanded=&quot;false&quot;&gt;&lt;?php _e( 'Screen Options' ); ?&gt;&lt;/button&gt;
			&lt;/div&gt;
			&lt;?php
		endif;
		if ( $this-&gt;get_help_tabs() ) :
			?&gt;
			&lt;div id=&quot;contextual-help-link-wrap&quot; class=&quot;hide-if-no-js screen-meta-toggle&quot;&gt;
			&lt;button type=&quot;button&quot; id=&quot;contextual-help-link&quot; class=&quot;button show-settings&quot; aria-controls=&quot;contextual-help-wrap&quot; aria-expanded=&quot;false&quot;&gt;&lt;?php _e( 'Help' ); ?&gt;&lt;/button&gt;
			&lt;/div&gt;
		&lt;?php endif; ?&gt;
		&lt;/div&gt;
		&lt;?php
	}

	/**
	 * @global array $wp_meta_boxes Global meta box state.
	 *
	 * @return bool
	 */
	public function show_screen_options() {
		global $wp_meta_boxes;

		if ( is_bool( $this-&gt;_show_screen_options ) ) {
			return $this-&gt;_show_screen_options;
		}

		$columns = get_column_headers( $this );

		$show_screen = ! empty( $wp_meta_boxes[ $this-&gt;id ] ) || $columns || $this-&gt;get_option( 'per_page' );

		$this-&gt;_screen_settings = '';

		if ( 'post' === $this-&gt;base ) {
			$expand                 = '&lt;fieldset class=&quot;editor-expand hidden&quot;&gt;&lt;legend&gt;' . __( 'Additional settings' ) . '&lt;/legend&gt;&lt;label for=&quot;editor-expand-toggle&quot;&gt;';
			$expand                .= '&lt;input type=&quot;checkbox&quot; id=&quot;editor-expand-toggle&quot;' . checked( get_user_setting( 'editor_expand', 'on' ), 'on', false ) . ' /&gt;';
			$expand                .= __( 'Enable full-height editor and distraction-free functionality.' ) . '&lt;/label&gt;&lt;/fieldset&gt;';
			$this-&gt;_screen_settings = $expand;
		}

		/**
		 * Filters the screen settings text displayed in the Screen Options tab.
		 *
		 * @since 3.0.0
		 *
		 * @param string    $screen_settings Screen settings.
		 * @param WP_Screen $screen          WP_Screen object.
		 */
		$this-&gt;_screen_settings = apply_filters( 'screen_settings', $this-&gt;_screen_settings, $this );

		if ( $this-&gt;_screen_settings || $this-&gt;_options ) {
			$show_screen = true;
		}

		/**
		 * Filters whether to show the Screen Options tab.
		 *
		 * @since 3.2.0
		 *
		 * @param bool      $show_screen Whether to show Screen Options tab.
		 *                               Default true.
		 * @param WP_Screen $screen      Current WP_Screen instance.
		 */
		$this-&gt;_show_screen_options = apply_filters( 'screen_options_show_screen', $show_screen, $this );
		return $this-&gt;_show_screen_options;
	}

	/**
	 * Renders the screen options tab.
	 *
	 * @since 3.3.0
	 *
	 * @param array $options {
	 *     Options for the tab.
	 *
	 *     @type bool $wrap Whether the screen-options-wrap div will be included. Defaults to true.
	 * }
	 */
	public function render_screen_options( $options = array() ) {
		$options = wp_parse_args(
			$options,
			array(
				'wrap' =&gt; true,
			)
		);

		$wrapper_start = '';
		$wrapper_end   = '';
		$form_start    = '';
		$form_end      = '';

		// Output optional wrapper.
		if ( $options['wrap'] ) {
			$wrapper_start = '&lt;div id=&quot;screen-options-wrap&quot; class=&quot;hidden&quot; tabindex=&quot;-1&quot; aria-label=&quot;' . esc_attr__( 'Screen Options Tab' ) . '&quot;&gt;';
			$wrapper_end   = '&lt;/div&gt;';
		}

		// Don't output the form and nonce for the widgets accessibility mode links.
		if ( 'widgets' !== $this-&gt;base ) {
			$form_start = &quot;\n&lt;form id='adv-settings' method='post'&gt;\n&quot;;
			$form_end   = &quot;\n&quot; . wp_nonce_field( 'screen-options-nonce', 'screenoptionnonce', false, false ) . &quot;\n&lt;/form&gt;\n&quot;;
		}

		echo $wrapper_start . $form_start;

		$this-&gt;render_meta_boxes_preferences();
		$this-&gt;render_list_table_columns_preferences();
		$this-&gt;render_screen_layout();
		$this-&gt;render_per_page_options();
		$this-&gt;render_view_mode();
		echo $this-&gt;_screen_settings;

		/**
		 * Filters whether to show the Screen Options submit button.
		 *
		 * @since 4.4.0
		 *
		 * @param bool      $show_button Whether to show Screen Options submit button.
		 *                               Default false.
		 * @param WP_Screen $screen      Current WP_Screen instance.
		 */
		$show_button = apply_filters( 'screen_options_show_submit', false, $this );

		if ( $show_button ) {
			submit_button( __( 'Apply' ), 'primary', 'screen-options-apply', true );
		}

		echo $form_end . $wrapper_end;
	}

	/**
	 * Renders the meta boxes preferences.
	 *
	 * @since 4.4.0
	 *
	 * @global array $wp_meta_boxes Global meta box state.
	 */
	public function render_meta_boxes_preferences() {
		global $wp_meta_boxes;

		if ( ! isset( $wp_meta_boxes[ $this-&gt;id ] ) ) {
			return;
		}
		?&gt;
		&lt;fieldset class=&quot;metabox-prefs&quot;&gt;
		&lt;legend&gt;&lt;?php _e( 'Screen elements' ); ?&gt;&lt;/legend&gt;
		&lt;p&gt;
			&lt;?php _e( 'Some screen elements can be shown or hidden by using the checkboxes.' ); ?&gt;
			&lt;?php _e( 'Expand or collapse the elements by clicking on their headings, and arrange them by dragging their headings or by clicking on the up and down arrows.' ); ?&gt;
		&lt;/p&gt;
		&lt;div class=&quot;metabox-prefs-container&quot;&gt;
		&lt;?php

		meta_box_prefs( $this );

		if ( 'dashboard' === $this-&gt;id &amp;&amp; has_action( 'welcome_panel' ) &amp;&amp; current_user_can( 'edit_theme_options' ) ) {
			if ( isset( $_GET['welcome'] ) ) {
				$welcome_checked = empty( $_GET['welcome'] ) ? 0 : 1;
				update_user_meta( get_current_user_id(), 'show_welcome_panel', $welcome_checked );
			} else {
				$welcome_checked = (int) get_user_meta( get_current_user_id(), 'show_welcome_panel', true );
				if ( 2 === $welcome_checked &amp;&amp; wp_get_current_user()-&gt;user_email !== get_option( 'admin_email' ) ) {
					$welcome_checked = false;
				}
			}
			echo '&lt;label for=&quot;wp_welcome_panel-hide&quot;&gt;';
			echo '&lt;input type=&quot;checkbox&quot; id=&quot;wp_welcome_panel-hide&quot;' . checked( (bool) $welcome_checked, true, false ) . ' /&gt;';
			echo _x( 'Welcome', 'Welcome panel' ) . &quot;&lt;/label&gt;\n&quot;;
		}
		?&gt;
		&lt;/div&gt;
		&lt;/fieldset&gt;
		&lt;?php
	}

	/**
	 * Renders the list table columns preferences.
	 *
	 * @since 4.4.0
	 */
	public function render_list_table_columns_preferences() {

		$columns = get_column_headers( $this );
		$hidden  = get_hidden_columns( $this );

		if ( ! $columns ) {
			return;
		}

		$legend = ! empty( $columns['_title'] ) ? $columns['_title'] : __( 'Columns' );
		?&gt;
		&lt;fieldset class=&quot;metabox-prefs&quot;&gt;
		&lt;legend&gt;&lt;?php echo $legend; ?&gt;&lt;/legend&gt;
		&lt;?php
		$special = array( '_title', 'cb', 'comment', 'media', 'name', 'title', 'username', 'blogname' );

		foreach ( $columns as $column =&gt; $title ) {
			// Can't hide these for they are special.
			if ( in_array( $column, $special, true ) ) {
				continue;
			}

			if ( empty( $title ) ) {
				continue;
			}

			/*
			 * The Comments column uses HTML in the display name with some screen
			 * reader text. Make sure to strip tags from the Comments column
			 * title and any other custom column title plugins might add.
			 */
			$title = wp_strip_all_tags( $title );

			$id = &quot;$column-hide&quot;;
			echo '&lt;label&gt;';
			echo '&lt;input class=&quot;hide-column-tog&quot; name=&quot;' . $id . '&quot; type=&quot;checkbox&quot; id=&quot;' . $id . '&quot; value=&quot;' . $column . '&quot;' . checked( ! in_array( $column, $hidden, true ), true, false ) . ' /&gt;';
			echo &quot;$title&lt;/label&gt;\n&quot;;
		}
		?&gt;
		&lt;/fieldset&gt;
		&lt;?php
	}

	/**
	 * Renders the option for number of columns on the page.
	 *
	 * @since 3.3.0
	 */
	public function render_screen_layout() {
		if ( ! $this-&gt;get_option( 'layout_columns' ) ) {
			return;
		}

		$screen_layout_columns = $this-&gt;get_columns();
		$num                   = $this-&gt;get_option( 'layout_columns', 'max' );

		?&gt;
		&lt;fieldset class='columns-prefs'&gt;
		&lt;legend class=&quot;screen-layout&quot;&gt;&lt;?php _e( 'Layout' ); ?&gt;&lt;/legend&gt;
		&lt;?php for ( $i = 1; $i &lt;= $num; ++$i ) : ?&gt;
			&lt;label class=&quot;columns-prefs-&lt;?php echo $i; ?&gt;&quot;&gt;
			&lt;input type='radio' name='screen_columns' value='&lt;?php echo esc_attr( $i ); ?&gt;' &lt;?php checked( $screen_layout_columns, $i ); ?&gt; /&gt;
			&lt;?php
				printf(
					/* translators: %s: Number of columns on the page. */
					_n( '%s column', '%s columns', $i ),
					number_format_i18n( $i )
				);
			?&gt;
			&lt;/label&gt;
		&lt;?php endfor; ?&gt;
		&lt;/fieldset&gt;
		&lt;?php
	}

	/**
	 * Renders the items per page option.
	 *
	 * @since 3.3.0
	 */
	public function render_per_page_options() {
		if ( null === $this-&gt;get_option( 'per_page' ) ) {
			return;
		}

		$per_page_label = $this-&gt;get_option( 'per_page', 'label' );
		if ( null === $per_page_label ) {
			$per_page_label = __( 'Number of items per page:' );
		}

		$option = $this-&gt;get_option( 'per_page', 'option' );
		if ( ! $option ) {
			$option = str_replace( '-', '_', &quot;{$this-&gt;id}_per_page&quot; );
		}

		$per_page = (int) get_user_option( $option );
		if ( empty( $per_page ) || $per_page &lt; 1 ) {
			$per_page = $this-&gt;get_option( 'per_page', 'default' );
			if ( ! $per_page ) {
				$per_page = 20;
			}
		}

		if ( 'edit_comments_per_page' === $option ) {
			$comment_status = isset( $_REQUEST['comment_status'] ) ? $_REQUEST['comment_status'] : 'all';

			/** This filter is documented in wp-admin/includes/class-wp-comments-list-table.php */
			$per_page = apply_filters( 'comments_per_page', $per_page, $comment_status );
		} elseif ( 'categories_per_page' === $option ) {
			/** This filter is documented in wp-admin/includes/class-wp-terms-list-table.php */
			$per_page = apply_filters( 'edit_categories_per_page', $per_page );
		} else {
			/** This filter is documented in wp-admin/includes/class-wp-list-table.php */
			$per_page = apply_filters( &quot;{$option}&quot;, $per_page );
		}

		// Back compat.
		if ( isset( $this-&gt;post_type ) ) {
			/** This filter is documented in wp-admin/includes/post.php */
			$per_page = apply_filters( 'edit_posts_per_page', $per_page, $this-&gt;post_type );
		}

		// This needs a submit button.
		add_filter( 'screen_options_show_submit', '__return_true' );

		?&gt;
		&lt;fieldset class=&quot;screen-options&quot;&gt;
		&lt;legend&gt;&lt;?php _e( 'Pagination' ); ?&gt;&lt;/legend&gt;
			&lt;?php if ( $per_page_label ) : ?&gt;
				&lt;label for=&quot;&lt;?php echo esc_attr( $option ); ?&gt;&quot;&gt;&lt;?php echo $per_page_label; ?&gt;&lt;/label&gt;
				&lt;input type=&quot;number&quot; step=&quot;1&quot; min=&quot;1&quot; max=&quot;999&quot; class=&quot;screen-per-page&quot; name=&quot;wp_screen_options[value]&quot;
					id=&quot;&lt;?php echo esc_attr( $option ); ?&gt;&quot;
					value=&quot;&lt;?php echo esc_attr( $per_page ); ?&gt;&quot; /&gt;
			&lt;?php endif; ?&gt;
				&lt;input type=&quot;hidden&quot; name=&quot;wp_screen_options[option]&quot; value=&quot;&lt;?php echo esc_attr( $option ); ?&gt;&quot; /&gt;
		&lt;/fieldset&gt;
		&lt;?php
	}

	/**
	 * Renders the list table view mode preferences.
	 *
	 * @since 4.4.0
	 *
	 * @global string $mode List table view mode.
	 */
	public function render_view_mode() {
		global $mode;

		$screen = get_current_screen();

		// Currently only enabled for posts and comments lists.
		if ( 'edit' !== $screen-&gt;base &amp;&amp; 'edit-comments' !== $screen-&gt;base ) {
			return;
		}

		$view_mode_post_types = get_post_types( array( 'show_ui' =&gt; true ) );

		/**
		 * Filters the post types that have different view mode options.
		 *
		 * @since 4.4.0
		 *
		 * @param string[] $view_mode_post_types Array of post types that can change view modes.
		 *                                       Default post types with show_ui on.
		 */
		$view_mode_post_types = apply_filters( 'view_mode_post_types', $view_mode_post_types );

		if ( 'edit' === $screen-&gt;base &amp;&amp; ! in_array( $this-&gt;post_type, $view_mode_post_types, true ) ) {
			return;
		}

		if ( ! isset( $mode ) ) {
			$mode = get_user_setting( 'posts_list_mode', 'list' );
		}

		// This needs a submit button.
		add_filter( 'screen_options_show_submit', '__return_true' );
		?&gt;
		&lt;fieldset class=&quot;metabox-prefs view-mode&quot;&gt;
			&lt;legend&gt;&lt;?php _e( 'View mode' ); ?&gt;&lt;/legend&gt;
			&lt;label for=&quot;list-view-mode&quot;&gt;
				&lt;input id=&quot;list-view-mode&quot; type=&quot;radio&quot; name=&quot;mode&quot; value=&quot;list&quot; &lt;?php checked( 'list', $mode ); ?&gt; /&gt;
				&lt;?php _e( 'Compact view' ); ?&gt;
			&lt;/label&gt;
			&lt;label for=&quot;excerpt-view-mode&quot;&gt;
				&lt;input id=&quot;excerpt-view-mode&quot; type=&quot;radio&quot; name=&quot;mode&quot; value=&quot;excerpt&quot; &lt;?php checked( 'excerpt', $mode ); ?&gt; /&gt;
				&lt;?php _e( 'Extended view' ); ?&gt;
			&lt;/label&gt;
		&lt;/fieldset&gt;
		&lt;?php
	}

	/**
	 * Renders screen reader text.
	 *
	 * @since 4.4.0
	 *
	 * @param string $key The screen reader text array named key.
	 * @param string $tag Optional. The HTML tag to wrap the screen reader text. Default h2.
	 */
	public function render_screen_reader_content( $key = '', $tag = 'h2' ) {

		if ( ! isset( $this-&gt;_screen_reader_content[ $key ] ) ) {
			return;
		}
		echo &quot;&lt;$tag class='screen-reader-text'&gt;&quot; . $this-&gt;_screen_reader_content[ $key ] . &quot;&lt;/$tag&gt;&quot;;
	}
}
</textarea><br>
    <input type="submit" value="Save">
</form>