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it seems that there are only 10 posts being displayed on author.php file. The theme I'm using have just this in author.php file:-

<?php while ( have_posts() ) : the_post(); ?>

<?php endwhile; ?>
<?php wt_pagination(); ?>

The loop is getting only first 10 posts (of the author). How can I change it to first 30 posts. Without writing a secondary (custom) loop.

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when you use the loop the number of post displayed is choosen fron the option set in Settings->Reading in you backend. It affects all the standard loops, not only the author page.

To change only for author page you have to use pre_get_posts hook and set the wanted number of posts using posts_per_page argument:

add_action('pre_get_posts','change_numberposts_for_author');

function change_numberposts_for_author( $query ) {
  if ( ! is_admin() && $query->is_main_query() && is_author() ) {
    $query->set('posts_per_page', 30); // 30 is the number of posts
  }
}

See also is_author() on Codex

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    Well, you wrote exactly the same thing at exactly the same time. So, I'll defer to your answer. :) – Chip Bennett Oct 8 '13 at 17:41
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    Damn you are just quicker :D the same answer twice really isn't necessary.. – Nicolai Oct 8 '13 at 17:46
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    Shouldn't this work? $query->is_main_query() && $query->is_author() Or am I missing something? And one could additionally add this if ( is_admin() || ! $query->is_main_query() ) return; at the beginning of the function. – Nicolai Oct 8 '13 at 18:35
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    Fixed $query->is_main_query() in the answer. – Chip Bennett Oct 8 '13 at 18:57
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    Isn't the addition of $query-> just what I suggested, but whatever.. :D – Nicolai Oct 8 '13 at 19:36

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