Custom Twitter button did not process php tags

Hi everyone,

I need to include a #hashtag in the content of tweet, so I used a custom field to try achieve this.

My custom code looked like this:

<a href="https://twitter.com/share" class="twitter-share-button" data-lang="pt_BR" data-url="<?php echo get_permalink(); ?>" data-via="variavel5" data-count="vertical" data-text="Participe do projeto <?php the_title(); ?> #<?php echo get_post_meta($post->ID, 'hashtag', true); ?>">Tweetar</a>

But the rendered content did not process the php tags, like this:

Participe do projeto <?php the_title(); ?> #<?php echo get_post_meta($post->ID, ‘hashtag’, true); ?> via @variavel5

Anyone please help me how can I do this?

Thanks in advance.