I want to use the Twitter follow button for site authors on all posts.
The Twitter structure is here:
<a href="https://twitter.com/twitterapi" class="twitter-follow-button" data-show-count="false" data-lang="en">Follow @twitterapi</a>
Yes, it works but this place must be generic. I should import Wordpress $user->ID in this structure. How can I do this?
You can use get_current_user_id() in wordpress.
To get the author of the current post try the following
<a href="https://twitter.com/<?php esc_attr_e(get_the_author()) ?>"
class="twitter-follow-button"
data-show-count="false" data-lang="en">Follow @<?php echo get_the_author() ?></a>
To get the ID of the current user logged you can simple user this wordpress function:
get_current_user_id()
To put it in whatever html code you should just open the tags where you need a dynamic value.
<a href="https://twitter.com/twitterapi" class="twitter-follow-button" data-show-count="false" data-lang="en">Follow <?php get_current_user_id() ?></a>
or using shortcut tags:
<a href="https://twitter.com/twitterapi" class="twitter-follow-button" data-show-count="false" data-lang="en">Follow <?=get_current_user_id()?></a>