我建议使用post_submitbox_misc_actions 操作如下例所示，为Publish meta box提供一个选项。

<?php

add_action( \'post_submitbox_misc_actions\', \'my_post_submitbox_misc_actions\' );

    function my_post_submitbox_misc_actions(){
    ?>
    <div class="misc-pub-section my-options">
        <label for="my_custom_post_action">My Option</label><br />
        <select id="my_custom_post_action" name="my_custom_post_action">
            <option value="1">First Option goes here</option>
            <option value="2">Second Option goes here</option>
        </select>
    </div>
    <?php
    }

    ?>