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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Amarkal\Settings;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Manager  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var Singleton The reference to *Singleton* instance of this class  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static $instance;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $pages = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $child_pages = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Returns the *Singleton* instance of this class.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return Singleton The *Singleton* instance.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public static function get_instance()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if( null === static::$instance )   | 
            
                            
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                        { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            static::$instance = new static();  | 
            
                            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return static::$instance;  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Add a page to the admin menu.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $args  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws \RuntimeException  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function add_page($args)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $slug = $args['slug'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if(array_key_exists($slug,$this->pages))  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new \RuntimeException("A page with slug '$slug' has already been registered"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->pages[$slug] = new Page($args);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get a page from the set of registered pages.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $slug  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return Page  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws \RuntimeException If no page was found for the given slug  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function get_page($slug)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if(!array_key_exists($slug,$this->pages))  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new \RuntimeException("The page '$slug' does not exist"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->pages[$slug];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Add a child setting page.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $args  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function add_child_page($args)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $parent_slug = $args['parent_slug'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if(!array_key_exists($parent_slug, $this->child_pages))  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->child_pages[$parent_slug] = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->child_pages[$parent_slug][$args['slug']] = new ChildPage($args);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get a child page from the set of registered child pages.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $slug  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $parent_slug  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return ChildPage  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws \RuntimeException If no child page was found for the given slug/parent_slug  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function get_child_page($slug, $parent_slug)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if(!array_key_exists($parent_slug, $this->child_pages) ||  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                           !array_key_exists($slug, $this->child_pages[$parent_slug]))  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new \RuntimeException("The child page '$slug' does not exist for the parent '$parent_slug'"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->child_pages[$parent_slug][$slug];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Register styles & scripts to be enqueued by settings child pages  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function register_scripts()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        \wp_register_style('amarkal-settings', \Amarkal\Core\Utility::path_to_url(__DIR__.'/assets/css/dist/amarkal-settings.min.css')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        \wp_register_script('amarkal-settings',\Amarkal\Core\Utility::path_to_url(__DIR__.'/assets/js/dist/amarkal-settings.min.js'),array('amarkal-ui')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Private constructor to prevent instantiation  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function __construct()   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->init();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Register scripts and initiate the request handler.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function init()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        \add_action('admin_init',array($this,'register_scripts')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $rh = RequestHandler::get_instance();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $rh->init();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                        
Let’s assume you have a class which uses late-static binding:
The code above will run fine in your PHP runtime. However, if you now create a sub-class and call the
getSomeVariable()on that sub-class, you will receive a runtime error:In the case above, it makes sense to update
SomeClassto useselfinstead: