Wordpress 数据库：将自定义字段的值添加到帖子开头（并合并保存）

Question

I need to get the value of a custom field ( _subtitle ) from the post meta and have it saved to the beginning of the post text (post_content).

How can I achieve this? (I tried the update() function but lost the post content before)

Answer 1

You need to use get_post_meta() it might look something like that if you want to place it within a template.

<?php
    $subs = get_post_meta(get_the_ID(),'_subtitle',true);

    $post_content = get_the_content();

    echo $subs.$post_content;
?>

This would be the gist of it, you could also filter the_content(); and place the code within the functions.php