From YOURLS to WP to Twitter

Well, the simplest solution would probably be to add this code to the meta section of your header.php template file:

<?php
if ( get_post_meta( $post_id, '_wp_jd_yourls', true ) ) {
    echo "<link rel='shortlink' href='".get_post_meta( $post_id, '_wp_jd_yourls', true )."' />";
}
?>

That just grabs the post meta saved YOURLS link from WP to Twitter and places it in the head of your document. This won’t catch anything saved by your old YOURLS plug-in, however.

Thank you, Joe, for the fast reply!

These are good news, that WP to Twitter also stores the short-url in a custom field. So I can alter your code and look also for the “old” value of the YOURLS-Plugin, display it like in your proposal or check if the post has the new variable _wp_jd_yourls stored.

So post with the new and the old plugin will have their short-link displayed.

Another solution might be to replace the old variable name with the new one inside the SQL-database.

This helped me a lot!

Thank you!

Hello!

For those who also want to migrate from YOURLS to Twitter to WP to Twitter here is the way I did it.

Entering the code Joe Dolson suggested won’t work perfectly, because afterwards you will have two shortlink entries in the head section, because WP does enter the post-id as shortlink like www.domain.com/index.php?p=1234. So we have to use a filter to change that link into “our” YOURLS shortlink.

So here is the trick:

First of all install and enable WP to Twitter and deactivate and delete YOURLS to Twitter.

Go to your phpMyAdmin installation, make a backup of the database first(!) and change the existing variable name from YOURLS to Twitter that stores the shortlink into the new one from WP to Twitter by entering the following SQL-Code. Change the wp prefix of wp_postmeta into your own prefix if necessary.

UPDATE 'wp_postmeta' SET 'meta_key' = '_wp_jd_yourls' WHERE 'meta_key' = 'yourls_shorturl'

Now enter the following code in the functions.php of your WordPress theme.

add_filter('pre_get_shortlink', 'gb_my_custom_shortlink', 10, 4);
function gb_my_custom_shortlink($false, $post_id, $context, $allow_slugs) {
	if ( (is_single() || is_page()) && !is_home() ) {
	global $post;
	$short_link = get_post_meta($post->ID, '_wp_jd_yourls', true);
	if('' == $short_link) return false;
}
	return $short_link;
}

This code will look if the post has a shortlink stored and replace the WP default shortlink with the correct YOURLS created link.

Thanks for posting that detailed migration guide.