Code bật tắt khóa nội dung bài viết/trang

// Code thêm tuỳ chọn ẩn nội dung bài viếtclasshiddencontentMetabox {private$screen = array('post','page',	);private$meta_fields = array(array('label' => 'Hide this content','id' => 'bnix_hide_content','default' => 'Ẩn nội dung bài này','type' => 'checkbox',		),	);publicfunction__construct() {add_action( 'add_meta_boxes', array( $this, 'add_meta_boxes' ) );add_action( 'save_post', array( $this, 'save_fields' ) );	}publicfunctionadd_meta_boxes() {foreach ( $this->screen as $single_screen ) {add_meta_box('hiddencontent',__( 'Hidden Content', 'bnix' ),array( $this, 'meta_box_callback' ),$single_screen,'advanced','default'			);		}	}publicfunctionmeta_box_callback( $post ) {wp_nonce_field( 'hiddencontent_data', 'hiddencontent_nonce' );echo'Bật / tắt ẩn nội dung';$this->field_generator( $post );	}publicfunctionfield_generator( $post ) {$output = '';foreach ( $this->meta_fields as $meta_field ) {$label = '<label for="'.$meta_field['id'] .'">'.$meta_field['label'] .'</label>';$meta_value = get_post_meta( $post->ID, $meta_field['id'], true );if ( empty( $meta_value ) ) {$meta_value = $meta_field['default']; }switch ( $meta_field['type'] ) {case'checkbox':$input = sprintf('<input %s id=" % s" name="% s" type="checkbox" value="1">',$meta_value === '1' ? 'checked' : '',$meta_field['id'],$meta_field['id']						);break;default:$input = sprintf('<input %s id="%s" name="%s" type="%s" value="%s">',$meta_field['type'] !== 'color' ? 'style="width: 100%"' : '',$meta_field['id'],$meta_field['id'],$meta_field['type'],$meta_value					);			}$output.=$this->format_rows( $label, $input );		}echo'<table class="form-table"><tbody>'.$output.'</tbody></table>';	}publicfunctionformat_rows( $label, $input ) {return'<tr><th>'.$label.'</th><td>'.$input.'</td></tr>';	}publicfunctionsave_fields( $post_id ) {if ( ! isset( $_POST['hiddencontent_nonce'] ) )return$post_id;$nonce = $_POST['hiddencontent_nonce'];if ( !wp_verify_nonce( $nonce, 'hiddencontent_data' ) )return$post_id;if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )return$post_id;foreach ( $this->meta_fields as $meta_field ) {if ( isset( $_POST[ $meta_field['id'] ] ) ) {switch ( $meta_field['type'] ) {case'email':$_POST[ $meta_field['id'] ] = sanitize_email( $_POST[ $meta_field['id'] ] );break;case'text':$_POST[ $meta_field['id'] ] = sanitize_text_field( $_POST[ $meta_field['id'] ] );break;				}update_post_meta( $post_id, $meta_field['id'], $_POST[ $meta_field['id'] ] );			} elseif ( $meta_field['type'] === 'checkbox' ) {update_post_meta( $post_id, $meta_field['id'], '0' );			}		}	}}if (class_exists('hiddencontentMetabox')) {newhiddencontentMetabox;};

add_filter( 'the_content', 'hide_content' );functionhide_content($content) {if(is_singular('post') || is_page()) {$hide = get_post_meta(get_the_ID(),'bnix_hide_content', true);if(is_user_logged_in() || !$hide) {return$content;		}else {$box = '<div class="pc_warn_box">						Bạn phải đăng nhập để được xem nội dung						<div class="pc_warn_box_btn_wrap">													<a class="pc_warn_box_btn pc_login_trig" href="/wp-login.php?redirect_to='.urlencode(get_permalink()).'"><i class="fas fa-key"></i>Đăng Nhập</a>							<a class="pc_warn_box_btn pc_registr_trig" href="/dang-ky"><i class="fas fa-thumbs-up"></i>Đăng Ký</a>						</div>					</div>';$box.='<style>.pc_warn_box{border-color:#ffcc47;border-style:solid;border-width:4px 4px 4px 54px;border-radius:2px;line-height:normal;padding:11px 14px;position:relative;margin:20px auto;max-width:620px;margin-left:0 !important;}.pc_warn_box:before{content:"f06a";font-family:"Font Awesome 5 Free",fontawesome;font-weight:900;position:absolute;left:-52px;top:50%;width:50px;text-align:center;height:30px;color:#fff;font-size:30px;line-height:26px;margin-top:-13px;text-shadow:2px 2px 6px rgba(100,100,100,.05);z-index:10}.pc_warn_box .pc_warn_box_btn{margin:12px 10px 1px 0!important;position:static!important;float:none!important;display:inline-block!important;text-decoration:none}.pc_warn_box_btn{background:#fefefe!important;border:1px solid #c5c5c5!important;border-radius:2px!important;box-shadow:none;color:#5f5f5f!important;padding:7px 15px!important;font-size:14px!important}.pc_warn_box i{font-size:98%;padding-right:8px}.pc_warn_box_btn:hover{background:#2d5386!important;border-color:#2d5386!important;color:#fff!important}</style>';return$box;		}	}elsereturn$content;}