我有这个基本的管理页面

功能。php

<?php include(\'ui.php\'); ?>

用户界面。php

<?php
function gui()
{
    include(\'gui.php\');
}
function add_page()
{
    $themename = \'Cesaro\';
    $page_function = \'gui\';
    add_menu_page( $themename." Options", $themename, \'edit_themes\', $page_function, \'gui\' );
}
add_action( \'admin_menu\', \'add_page\' );
?>

gui。php

<form name="input" action="post_options_from_form.php" method="post">
    <article>
        <label>Firstname</label><input type="text" class="x-input"/>
    </article>
    <article>
        <label>Lastname</label><input type="text" class="x-input"/>
    </article>
    <article>
        <label>City</label><input type="text" class="x-input"/>
    </article>
    <input type="submit" value="Update Options" class="x-button"/>
</form>

当我单击“更新选项”时，会出现错误

The requested URL /wp-admin/post_options_from_form.php was not found on this server.

如何确保post值以我在post操作中指定的php结尾？。我的post php文件是post_options_from_form.php

<form name="input" action="<?php echo get_bloginfo( \'template_directory\' ).\'/\'.\'post_options_from_form.php\'; ?>" method="post">

<form name="input" action="admin.php?page=admin_page" method="post">

function admin_page()
{
require(\'post_options_from_form.php\');
}