gistfile1.php

<?php 
function createSteemPublishField()
    {
        $post_id = get_the_ID();

        if (get_post_type($post_id) != 'post') {
            return;
        }

        if (get_post_status ($post_id) == 'publish')
            return;

        wp_nonce_field('Steempress_sp_custom_nonce_'.$post_id, 'Steempress_sp_custom_nonce');

        $value = get_post_meta($post_id, 'Steempress_sp_steem_publish', true);
        if ($value == "0")
            $checked = "";
        else
            $checked = "checked";

        ?>
        <div class="misc-pub-section misc-pub-section-last">
            <label><input type="checkbox" value="1" <?php echo $checked; ?> name="Steempress_sp_steem_publish" />Publish to steem </label>
        </div>
        <?php
    }