好的，我的坏蛋在抄本页面上找到了答案，但在最下面，所以我也在这里添加了这个，所以如果像我这样的人没有在WordPress的抄本上找到它，他们可以在这里找到：）

仅使用get_admin_page_title();

See the example 1 below:

function register_my_custom_submenu_page() {
    add_submenu_page( 
        \'tools.php\', 
        \'My Custom Submenu Page\', 
        \'My Custom Submenu Page\', 
        \'manage_options\', 
        \'my-custom-submenu-page\', 
        \'my_custom_submenu_page_callback\' 
    );
}

function my_custom_submenu_page_callback() {
    echo \'<div class="wrap"><div id="icon-tools" class="icon32"></div>\';
        echo get_admin_page_title();
    echo \'</div>\';
}

And here is the example 2 below:

function register_my_custom_submenu_page() {
    add_submenu_page( 
        \'tools.php\', 
        \'My Custom Submenu Page\', 
        \'My Custom Submenu Page\', 
        \'manage_options\', 
        \'my-custom-submenu-page\', 
        \'my_custom_submenu_page_callback\' 
    );
}

function my_custom_submenu_page_callback() {
    global $title;
    echo \'<div class="wrap"><div id="icon-tools" class="icon32"></div>\';
        echo $title;
    echo \'</div>\';
}