i have a plugins with just a single php code

Plugin Name: COinS Metadata Exposer
Plugin URI: http://www.zotero.org
Description: Makes your blog readable by Zotero and other COinS interpreters.
Version: 0.5
Author: Sean Takats - Center for History and New Media
Author URI: http://chnm.gmu.edu

Copyright 2007 Sean Takats (email: stakats@gmu.edu)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

add_filter('the_content', 'coinsify_the_content');

function coinsify_the_content($content)
    foreach((get_the_category()) as $cat) {
        $cats = $cats . "&amp;rft.subject=" . urlencode($cat->cat_name);
    } ?>
    <span class="Z3988" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&amp;rfr_id=info%3Asid%2Focoins.info%3Agenerator&amp;rft.title=<?php echo(urlencode(get_the_title())); ?>&amp;rft.aulast=<?php echo(urlencode(get_the_author_lastname())); ?>&amp;rft.aufirst=<?php echo(urlencode(get_the_author_firstname())); echo $cats; ?>&amp;rft.source=<?php echo(urlencode(get_bloginfo('name'))); ?>&amp;rft.date=<?php the_time('Y-m-d'); ?>&amp;rft.type=blogPost&amp;rft.format=text&amp;rft.identifier=<?php the_permalink(); ?>&amp;rft.language=English"></span>
    return $content;

but the plugins causing error with following code

<br /> Deprecated: get_the_author_lastname started <strong> deprecated </strong> since version 2.8.0! 
Use get_the_author_meta ('last_name'). in /home/dgrou/wp-includes/functions.php on line 4861 <br /> 
Mike, <br /> Deprecated: get_the_author_firstname started <strong> deprecated </strong> since version 
2.8.0! Use get_the_author_meta ('first_name'). in /home/dgrou//wp-includes/functions.php on line 4861 
<br /> 

Can someone help which line i should replace the deprecated code? or the full fixed code would be nice

thank you


Note: I'm not simply giving you the full fixed code, but the line in which you need to make the changes is the one with the <span class="Z3988" ...>.

So yes, both get_the_author_firstname() and get_the_author_lastname() have been deprecated and as said in the error, you should instead be using get_the_author_meta().

And in the coinsify_the_content() function, just find and:

  1. Replace the get_the_author_firstname() with get_the_author_meta( 'first_name' ).

  2. Replace the get_the_author_lastname() with get_the_author_meta( 'last_name' ).

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