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                <?php  | 
            
                            
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                namespace Undefined\Stash\Admin;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Clean up adminpages  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                function login_redirect($redirect_to, $request, $user)  | 
            
                            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    return admin_url('edit.php?post_type=page'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                add_filter('login_redirect', __NAMESPACE__ . '\\login_redirect', 10, 3); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                function remove_menu()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    remove_menu_page('index.php'); //dashboard | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    remove_menu_page('edit-comments.php'); //comments | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                add_action('admin_menu', __NAMESPACE__ . '\\remove_menu', 99); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                function remove_wp_logo($wp_admin_bar)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $wp_admin_bar->remove_node('wp-logo'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                add_action('admin_bar_menu', __NAMESPACE__ . '\\remove_wp_logo', 999); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                function change_footer_admin()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    return ' ';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                add_filter('admin_footer_text', __NAMESPACE__ . '\\change_footer_admin', 9999); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                function change_footer_version()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    return ' ';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                add_filter('update_footer', __NAMESPACE__ . '\\change_footer_version', 9999); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Change the opacity of WordPress Admin Bar  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                function adminbar_opacity()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $adminbar_opacity = '<style type="text/css">#wpadminbar { filter:alpha(opacity=50); opacity:0.5; }</style>'; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    echo $adminbar_opacity;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                if (!is_admin()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    add_action('wp_head', __NAMESPACE__ . '\\adminbar_opacity'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Redirect Dashboard to pages  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                function redirect_from_dashboard()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    wp_redirect(admin_url('edit.php?post_type=page')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    exit;  | 
            
                            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                add_action('wp_dashboard_setup', __NAMESPACE__ . '\\redirect_from_dashboard'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                function admin_menu()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    global $menu;  | 
            
                            
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                    $url = '/';  | 
            
                            
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                    $menu[0] = array(__('STASH'), 'read', '#', 'undefined-logo', 'undefined-logo'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                add_action('admin_menu', __NAMESPACE__ . '\\admin_menu'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                function admin_style()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    echo '<link rel="stylesheet" href="' . get_template_directory_uri() . '/dist/css/admin/main.css" type="text/css" media="all" />';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                add_action('admin_head', __NAMESPACE__ . '\\admin_style'); | 
            
            
                                                        
            
                                    
            
            
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The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.