wordpress Prevent CSS Caching

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WordPress:

<link rel="stylesheet" href="<?php bloginfo('stylesheet_url'); echo '?' . filemtime( get_stylesheet_directory() . '/style.css'); ?>" type="text/css" media="screen" />

bbPress:

<link rel="stylesheet" href="<?php bb_stylesheet_uri(); echo '?' . filemtime( bb_get_active_theme_directory() . '/style.css'); ?>" type="text/css" media="screen" />

Adds stylesheet with time of last update. If the number changes the browser updates the CSS instead of using cached version. Easily amended to be none WP specific.

wordpress Paginate Custom Post Types

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<?php 
  $temp = $wp_query; 
  $wp_query = null; 
  $wp_query = new WP_Query(); 
  $wp_query->query('showposts=6&post_type=news'.'&paged='.$paged); 

  while ($wp_query->have_posts()) : $wp_query->the_post(); 
?>

  <!-- LOOP: Usual Post Template Stuff Here-->

<?php endwhile; ?>

<nav>
    <?php previous_posts_link('&laquo; Newer') ?>
    <?php next_posts_link('Older &raquo;') ?>
</nav>

<?php 
  $wp_query = null; 
  $wp_query = $temp;  // Reset
?>

wordpress Output Excerpt Manually

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There is always the_excerpt(), but that does some pretty specific stuff (e.g. adding paragraph tags, adding [...], not respect the more comment, use the saved excerpt...). Advanced Excerpt is pretty good at customizing that.

If you want to get real simple though:

<?php 
  $content = get_the_content(); 
  echo substr(strip_tags($content), 0, 130) . '...'; 
?>

wordpress Natural Sort Using Post meta_key

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@@ -2033,6 +2033,7 @@

      if ( !empty($q['meta_key']) ) {
              $allowed_keys[] = $q['meta_key'];
              $allowed_keys[] = 'meta_value';
+             $allowed_keys[] = 'meta_value_num';
      }
      $q['orderby'] = urldecode($q['orderby']);
      $q['orderby'] = addslashes_gpc($q['orderby']);

@@ -2056,6 +2057,9 @@

      case 'meta_value':
              $orderby = "$wpdb->postmeta.meta_value";
              break;
+     case 'meta_value_num':
+             $orderby = "$wpdb->postmeta.meta_value+0";
+             break;
      default:
              $orderby = "$wpdb->posts.post_" . $orderby;
}

This is a direct edit to a core file: /wp-includes/query.php Note the plus signs in the above code indicate new lines to add.

Author Notes:

A client wanted me to setup a custom field called "Guide Rank" which allowed them to assign #1 - 20 for a list of Bars they were posting about.

After running the posts query I found that the meta_value was being treated as a string and as such the sort order was jumbled:

eg. 1, 10, 2, 3css-tricks.comC 7 , 8 , 9

To get WordPress/MySQL to use "Natural Sort Order" you just need to apply +0 to the field name and it'll be treated as a number (eg. meta_value+0).

So that existing behavior is not interrupted I've just added the new type 'meta_value_num'.

My query line now looks like:

$guide_posts = new WP_Query("cat=12&meta_key=guide_rank&orderby=meta_value_num&order=ASC&showposts=10");

Which returns: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

This is up for inclusion in the WordPress trunk - so hopefully once it gets applied there should be no need for manually editing the file.

wordpress Move WordPress Admin Bar to the Bottom

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Pre WordPress 3.3 only. Either add this CSS to your CSS file, add all the code to your functions.php file, or make a quick little plugin.

function fb_move_admin_bar() {
    echo '
    <style type="text/css">
    body {
    margin-top: -28px;
    padding-bottom: 28px;
    }
    body.admin-bar #wphead {
       padding-top: 0;
    }
    body.admin-bar #footer {
       padding-bottom: 28px;
    }
    #wpadminbar {
        top: auto !important;
        bottom: 0;
    }
    #wpadminbar .quicklinks .menupop ul {
        bottom: 28px;
    }
    </style>';
}
// on backend area
add_action( 'admin_head', 'fb_move_admin_bar' );
// on frontend area
add_action( 'wp_head', 'fb_move_admin_bar' );

Reference URL

wordpress Make Archives.php Include Custom Post Types

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Archives.php only shows content of type 'post', but you can alter it to include custom post types. Add this filter to your functions.php file:

function namespace_add_custom_types( $query ) {
  if( is_category() || is_tag() && empty( $query->query_vars['suppress_filters'] ) ) {
    $query->set( 'post_type', array(
     'post', 'your-custom-post-type-here'
		));
	  return $query;
	}
}
add_filter( 'pre_get_posts', 'namespace_add_custom_types' );

wordpress Login/Logout and User Welcome

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<div id="user-details">
<?php
   if (is_user_logged_in()) {
      $user = wp_get_current_user();
      echo ‘Welcome back <strong>’.$user->display_name.‘</strong> !’;
   } else { ?>
      Please <strong><?php wp_loginout(); ?></strong>
      or <a href="<?php echo get_option(’home’); ?>/wp-login.php?action=register"> <strong>Register</strong></a>
<?php } ?>
</div>

Uses WordPress functions and queries to pull user information, and to display the login/logout/register links.