WordPress 管理バーを非表示にする方法

<code class="language-php">// 在管理栏中显示域名而不是网站标题
add_action( 'admin_bar_menu', 'customize_my_wp_admin_bar', 80 );
function customize_my_wp_admin_bar( $wp_admin_bar ) {
    $node = $wp_admin_bar->get_node('site-name');
    $new_site_name = preg_replace("(^https?://)", "", get_home_url() );
    $node->title = $new_site_name;
    $wp_admin_bar->add_node($node);
}

final class Kama_Collapse_Toolbar {

    public static function init(){
        add_action( 'admin_bar_init', [ __CLASS__, 'hooks' ] );
    }

    public static function hooks(){

        // remove html margin bumps
        remove_action( 'wp_head', '_admin_bar_bump_cb' );

        add_action( 'wp_head', [ __CLASS__, 'collapse_styles' ] );
    }

    public static function collapse_styles(){

        // do nothing for admin-panel.
        // Remove this if you want to collapse admin-bar in admin-panel too.
        if( is_admin() ){
            return;
        }

        ob_start();
        ?>

        <style>
            #wpadminbar {
                position: fixed !important;
                top: -32px !important;
                transition: top 0.3s ease;
            }
            #wpadminbar.expanded {
                top: 0 !important;
            }
            #wpadminbar #wp-admin-bar-site-name {
                display: none;
            }
            #wpadminbar #wp-admin-bar-site-name.expanded {
                display: block;
            }
            #wpadminbar #wp-admin-bar-site-name .ab-item:before {
                content: "\f321"; /* Dashicons icon */
                font-family: 'dashicons';
                speak: none;
                font-style: normal;
                font-weight: normal;
                font-variant: normal;
                text-transform: none;
                line-height: 1;
                -webkit-font-smoothing: antialiased;
                -moz-osx-font-smoothing: grayscale;
                color: red; /* Icon color */
                margin-right: 0.3em;
            }
            #wpadminbar #wp-admin-bar-site-name.expanded .ab-item:before {
                display: none;
            }
        </style>

        <?php
        echo ob_get_clean();
    }
}

Kama_Collapse_Toolbar::init();</code>