Complex classes like Admin_Menu often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Admin_Menu, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 17 | class Admin_Menu extends Base_Admin_Menu { | 
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| 18 | |||
| 19 | /**  | 
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| 20 | * Create the desired menu output.  | 
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| 21 | */  | 
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| 22 | 	public function reregister_menu_items() { | 
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| 23 | // Constant is not defined until parse_request.  | 
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| 24 | 		if ( ! $this->is_api_request ) { | 
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| 25 | $this->is_api_request = defined( 'REST_REQUEST' ) && REST_REQUEST;  | 
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| 26 | }  | 
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| 27 | |||
| 28 | /*  | 
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| 29 | * Whether links should point to Calypso or wp-admin.  | 
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| 30 | *  | 
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| 31 | * Options:  | 
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| 32 | * false - Calypso (Default).  | 
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| 33 | * true - wp-admin.  | 
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| 34 | */  | 
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| 35 | $wp_admin = $this->should_link_to_wp_admin();  | 
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| 36 | |||
| 37 | // Remove separators.  | 
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| 38 | remove_menu_page( 'separator1' );  | 
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| 39 | |||
| 40 | $this->add_stats_menu();  | 
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| 41 | $this->add_upgrades_menu();  | 
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| 42 | $this->add_posts_menu( $wp_admin );  | 
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| 43 | $this->add_media_menu( $wp_admin );  | 
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| 44 | $this->add_page_menu( $wp_admin );  | 
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| 45 | $this->add_testimonials_menu( $wp_admin );  | 
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| 46 | $this->add_portfolio_menu( $wp_admin );  | 
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| 47 | $this->add_comments_menu( $wp_admin );  | 
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| 48 | |||
| 49 | // Whether Themes/Customize links should point to Calypso (false) or wp-admin (true).  | 
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| 50 | $wp_admin_themes = $wp_admin;  | 
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| 51 | $wp_admin_customize = $wp_admin;  | 
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| 52 | $this->add_appearance_menu( $wp_admin_themes, $wp_admin_customize );  | 
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| 53 | $this->add_plugins_menu( $wp_admin );  | 
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| 54 | $this->add_users_menu( $wp_admin );  | 
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| 55 | |||
| 56 | // Whether Import/Export links should point to Calypso (false) or wp-admin (true).  | 
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| 57 | $wp_admin_import = $wp_admin;  | 
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| 58 | $wp_admin_export = $wp_admin;  | 
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| 59 | $this->add_tools_menu( $wp_admin_import, $wp_admin_export );  | 
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| 60 | |||
| 61 | $this->add_options_menu( $wp_admin );  | 
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| 62 | $this->add_jetpack_menu();  | 
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| 63 | $this->add_gutenberg_menus( $wp_admin );  | 
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| 64 | |||
| 65 | // Remove Links Manager menu since its usage is discouraged. https://github.com/Automattic/wp-calypso/issues/51188.  | 
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| 66 | // @see https://core.trac.wordpress.org/ticket/21307#comment:73.  | 
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| 67 | 		if ( $this->should_disable_links_manager() ) { | 
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| 68 | remove_menu_page( 'link-manager.php' );  | 
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| 69 | }  | 
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| 70 | |||
| 71 | ksort( $GLOBALS['menu'] );  | 
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| 72 | }  | 
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| 73 | |||
| 74 | /**  | 
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| 75 | * Check if Links Manager is being used.  | 
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| 76 | */  | 
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| 77 | 	public function should_disable_links_manager() { | 
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| 78 | // The max ID number of the auto-generated links.  | 
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| 79 | // See /wp-content/mu-plugins/wpcom-wp-install-defaults.php in WP.com.  | 
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| 80 | $max_default_id = 10;  | 
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| 81 | |||
| 82 | // We are only checking the latest entry link_id so are limiting the query to 1.  | 
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| 83 | $link_manager_links = get_bookmarks(  | 
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| 84 | array(  | 
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| 85 | 'orderby' => 'link_id',  | 
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| 86 | 'order' => 'DESC',  | 
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| 87 | 'limit' => 1,  | 
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| 88 | 'hide_invisible' => 0,  | 
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| 89 | )  | 
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| 90 | );  | 
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| 91 | |||
| 92 | // Ordered links by ID descending, check if the first ID is more than $max_default_id.  | 
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| 93 | 		if ( count( $link_manager_links ) > 0 && $link_manager_links[0]->link_id > $max_default_id ) { | 
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| 94 | return false;  | 
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| 95 | }  | 
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| 96 | |||
| 97 | return true;  | 
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| 98 | }  | 
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| 99 | |||
| 100 | /**  | 
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| 101 | * Adds My Home menu.  | 
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| 102 | */  | 
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| 103 | 	public function add_my_home_menu() { | 
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| 104 | $this->update_menu( 'index.php', 'https://wordpress.com/home/' . $this->domain, __( 'My Home', 'jetpack' ), 'manage_options', 'dashicons-admin-home' );  | 
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| 105 | }  | 
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| 106 | |||
| 107 | /**  | 
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| 108 | * Adds upsell nudge as a menu.  | 
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| 109 | *  | 
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| 110 | * @param object $nudge The $nudge object containing the content, CTA, link and tracks.  | 
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| 111 | */  | 
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| 112 | 	public function add_upsell_nudge( $nudge ) { | 
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| 113 | $message = '  | 
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| 114 | <div class="upsell_banner">  | 
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| 115 | <div class="banner__info">  | 
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| 116 | <div class="banner__title">%1$s</div>  | 
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| 117 | </div>  | 
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| 118 | <div class="banner__action">  | 
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| 119 | <button type="button" class="button">%2$s</button>  | 
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| 120 | </div>  | 
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| 121 | </div>';  | 
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| 122 | |||
| 123 | $message = sprintf(  | 
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| 124 | $message,  | 
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| 125 | wp_kses( $nudge['content'], array() ),  | 
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| 126 | wp_kses( $nudge['cta'], array() )  | 
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| 127 | );  | 
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| 128 | |||
| 129 | add_menu_page( 'site-notices', $message, 'read', 'https://wordpress.com' . $nudge['link'], null, null, 1 );  | 
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| 130 | add_filter( 'add_menu_classes', array( $this, 'set_site_notices_menu_class' ) );  | 
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| 131 | }  | 
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| 132 | |||
| 133 | /**  | 
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| 134 | * Adds a custom element class and id for Site Notices's menu item.  | 
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| 135 | *  | 
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| 136 | * @param array $menu Associative array of administration menu items.  | 
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| 137 | * @return array  | 
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| 138 | */  | 
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| 139 | 	public function set_site_notices_menu_class( array $menu ) { | 
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| 140 | 		foreach ( $menu as $key => $menu_item ) { | 
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| 141 | 			if ( 'site-notices' !== $menu_item[3] ) { | 
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| 142 | continue;  | 
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| 143 | }  | 
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| 144 | |||
| 145 | $classes = ' toplevel_page_site-notices';  | 
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| 146 | |||
| 147 | 			if ( isset( $menu_item[4] ) ) { | 
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| 148 | $menu[ $key ][4] = $menu_item[4] . $classes;  | 
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| 149 | $menu[ $key ][5] = 'toplevel_page_site-notices';  | 
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| 150 | break;  | 
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| 151 | }  | 
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| 152 | }  | 
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| 153 | |||
| 154 | return $menu;  | 
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| 155 | }  | 
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| 156 | |||
| 157 | /**  | 
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| 158 | * Adds Stats menu.  | 
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| 159 | */  | 
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| 160 | 	public function add_stats_menu() { | 
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| 163 | |||
| 164 | /**  | 
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| 165 | * Adds Upgrades menu.  | 
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| 166 | *  | 
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| 167 | * @param string $plan The current WPCOM plan of the blog.  | 
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| 
                                                                                                    
                        
                         | 
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| 168 | */  | 
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| 169 | 	public function add_upgrades_menu( $plan = null ) { | 
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| 204 | |||
| 205 | /**  | 
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| 206 | * Adds Posts menu.  | 
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| 207 | *  | 
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| 208 | * @param bool $wp_admin Optional. Whether links should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 209 | */  | 
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| 210 | 	public function add_posts_menu( $wp_admin = false ) { | 
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| 223 | |||
| 224 | /**  | 
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| 225 | * Adds Media menu.  | 
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| 226 | *  | 
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| 227 | * @param bool $wp_admin Optional. Whether links should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 228 | */  | 
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| 229 | 	public function add_media_menu( $wp_admin = false ) { | 
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| 238 | |||
| 239 | /**  | 
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| 240 | * Adds Page menu.  | 
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| 241 | *  | 
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| 242 | * @param bool $wp_admin Optional. Whether links should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 243 | */  | 
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| 244 | 	public function add_page_menu( $wp_admin = false ) { | 
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| 255 | |||
| 256 | /**  | 
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| 257 | * Adds Testimonials menu.  | 
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| 258 | *  | 
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| 259 | * @param bool $wp_admin Optional. Whether links should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 260 | */  | 
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| 261 | 	public function add_testimonials_menu( $wp_admin = false ) { | 
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| 264 | |||
| 265 | /**  | 
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| 266 | * Adds Portfolio menu.  | 
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| 267 | *  | 
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| 268 | * @param bool $wp_admin Optional. Whether links should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 269 | */  | 
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| 270 | 	public function add_portfolio_menu( $wp_admin = false ) { | 
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| 273 | |||
| 274 | /**  | 
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| 275 | * Adds a custom post type menu.  | 
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| 276 | *  | 
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| 277 | * @param string $post_type Custom post type.  | 
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| 278 | * @param bool $wp_admin Optional. Whether links should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 279 | */  | 
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| 280 | 	public function add_custom_post_type_menu( $post_type, $wp_admin = false ) { | 
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| 291 | |||
| 292 | /**  | 
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| 293 | * Adds Comments menu.  | 
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| 294 | *  | 
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| 295 | * @param bool $wp_admin Optional. Whether links should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 296 | */  | 
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| 297 | 	public function add_comments_menu( $wp_admin = false ) { | 
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| 304 | |||
| 305 | /**  | 
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| 306 | * Adds Appearance menu.  | 
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| 307 | *  | 
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| 308 | * @param bool $wp_admin_themes Optional. Whether Themes link should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 309 | * @param bool $wp_admin_customize Optional. Whether Customize link should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 310 | * @return string The Customizer URL.  | 
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| 311 | */  | 
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| 312 | 	public function add_appearance_menu( $wp_admin_themes = false, $wp_admin_customize = false ) { | 
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| 356 | |||
| 357 | /**  | 
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| 358 | * Adds Plugins menu.  | 
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| 359 | *  | 
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| 360 | * @param bool $wp_admin Optional. Whether links should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 361 | */  | 
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| 362 | 	public function add_plugins_menu( $wp_admin = false ) { | 
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| 372 | |||
| 373 | /**  | 
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| 374 | * Adds Users menu.  | 
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| 375 | *  | 
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| 376 | * @param bool $wp_admin Optional. Whether links should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 377 | */  | 
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| 378 | 	public function add_users_menu( $wp_admin = false ) { | 
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| 402 | |||
| 403 | /**  | 
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| 404 | * Adds Tools menu.  | 
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| 405 | *  | 
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| 406 | * @param bool $wp_admin_import Optional. Whether Import link should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 407 | * @param bool $wp_admin_export Optional. Whether Export link should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 408 | */  | 
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| 409 | 	public function add_tools_menu( $wp_admin_import = false, $wp_admin_export = false ) { | 
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| 425 | |||
| 426 | /**  | 
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| 427 | * Adds Settings menu.  | 
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| 428 | *  | 
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| 429 | * @param bool $wp_admin Optional. Whether links should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 430 | */  | 
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| 431 | 	public function add_options_menu( $wp_admin = false ) { | 
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| 445 | |||
| 446 | /**  | 
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| 447 | * Adds Jetpack menu.  | 
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| 448 | */  | 
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| 449 | 	public function add_jetpack_menu() { | 
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| 474 | |||
| 475 | /**  | 
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| 476 | * Re-adds the Site Editor menu without the (beta) tag, and where we want it.  | 
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| 477 | *  | 
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| 478 | * @param bool $wp_admin Optional. Whether links should point to Calypso or wp-admin. Default false (Calypso).  | 
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| 479 | */  | 
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| 480 | 	public function add_gutenberg_menus( $wp_admin = false ) { | 
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| 503 | |||
| 504 | /**  | 
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| 505 | * Whether to use wp-admin pages rather than Calypso.  | 
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| 506 | *  | 
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| 507 | * @return bool  | 
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| 508 | */  | 
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| 509 | 	public function should_link_to_wp_admin() { | 
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| 512 | }  | 
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| 513 | 
This check looks for
@paramannotations where the type inferred by our type inference engine differs from the declared type.It makes a suggestion as to what type it considers more descriptive.
Most often this is a case of a parameter that can be null in addition to its declared types.