Add hashtags to twitter

What I’ve done is adding the below function to my theme functions.php file:

function append_jetpack_hashtags($ignorePostStatus = false) {
    $mess_max_length = 118;
    
    $strip_spaces = true;
   
    $meta = '_wpas_mess';
    
    $p = get_post();
    if (empty($p)) return;
    if (!$ignorePostStatus && $p->post_status === 'publish') return;
    $mess = get_post_meta($p->ID, $meta, true);

    if (empty($mess)) $mess = $p->post_title;
    else {
        if ($mess[0] == "#") {
            $a = explode(" ", $mess);
            $onlyHashtags = true;
            foreach ($a as $w) {
                if ($w[0] != "#") {
                    $onlyHashtags = false;
                    break;
                }
            }
            if ($onlyHashtags) $mess = $p->post_title ." ". $mess;
        }
    }

    if (!empty($mess) && !empty($mess_max_length) && $mess_max_length <= (strlen($mess))) return;

    // Change to the list of hashtags you want to be displayed.
    $ta = array( 'forex', 'trading' );

    if (empty($ta)) return;

    if (empty($mess)) $mess = '';

    foreach ($ta as $t) {
        // Create the hashtag, stripping spaces if needed.
        $ht = '#' . (($strip_spaces) ? str_replace(' ', '', $t) : $t);
        // only process newly-added hashtags, skipping duplicate ones
        if (stripos($mess,$ht) === false) {	
            if (!empty($mess_max_length) && $mess_max_length <= (strlen($mess) + strlen($ht))) break;
            $mess .= ' '.$ht;
        }
    }

    update_post_meta($p->ID, $meta, $mess);
}
add_action('save_post', 'append_jetpack_hashtags', 99);

Change the below array to the hashtags you want to be displayed.
$ta = array( 'forex', 'trading' );
Or you can use this to automatically use the post tags as hashtags
$ta = wp_get_post_tags();

This does however, add the hashtags to every social media. But hey, nearly all social networks support hashtags, don’t they?

Although I changed it, credits to the original author of the code (I cannot find the original location).

@stevemordue: Great question! Are you trying to automatically add hashtags to every post, or are you trying to add them manually for each post? If the latter, you can customize the message you send to Twitter for each post, and simply include the hashtags in that message.

I will try the function above and report back. Looks like it might do the job, thanks

That sounds like a plan! Please let us know if you have any other questions.