These buttons (like one for adding an <hr> tag) aren't there by default in the WordPress visual editor, but you can turn them on pretty easily. This is code for your active theme's functions.php file, or make a functionality plugin.

function add_more_buttons($buttons) {
 $buttons[] = 'hr';
 $buttons[] = 'del';
 $buttons[] = 'sub';
 $buttons[] = 'sup';
 $buttons[] = 'fontselect';
 $buttons[] = 'fontsizeselect';
 $buttons[] = 'cleanup';
 $buttons[] = 'styleselect';
 return $buttons;
}
add_filter("mce_buttons_3", "add_more_buttons");

Reference URL

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Super long URL's are a sure fire sign the comment is spammy. This will mark comments with URL's (as the author URL, not just in the text) longer than 50 characters as spam, otherwise leave their state the way it is.

<?php

  function rkv_url_spamcheck( $approved , $commentdata ) {
    return ( strlen( $commentdata['comment_author_url'] ) > 50 ) ? 'spam' : $approved;
  }

  add_filter( 'pre_comment_approved', 'rkv_url_spamcheck', 99, 2 );

?>

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A mini plugin:

<?php
/*
 * Plugin Name: Mini Admin Bar
 * Plugin URI: http://www.netyou.co.il/
 * Description: Makes the admin bar a small button on the left and expands on hover.
 * Version: 1.0
 * Author: NetYou
 * Author URI: http://www.netyou.co.il/
 * License: MIT
 * Copyright: NetYou
*/
 
add_action('get_header', 'my_filter_head');
function my_filter_head() { remove_action('wp_head', '_admin_bar_bump_cb'); }
 
function my_admin_css() {
        if ( is_user_logged_in() ) {
        ?>
        <style type="text/css">
            #wpadminbar {
                width: 47px;
                min-width: auto;
                overflow: hidden;
                -webkit-transition: .4s width;
                -webkit-transition-delay: 1s;
                -moz-transition: .4s width;
                -moz-transition-delay: 1s;
                -o-transition: .4s width;
                -o-transition-delay: 1s;
                -ms-transition: .4s width;
                -ms-transition-delay: 1s;
                transition: .4s width;
                transition-delay: 1s;
            }
            
            #wpadminbar:hover {
                width: 100%;
                overflow: visible;
                -webkit-transition-delay: 0;
                -moz-transition-delay: 0;
                -o-transition-delay: 0;
                -ms-transition-delay: 0;
                transition-delay: 0;
            }
        </style>
        <?php }
}
add_action('wp_head', 'my_admin_css');

?>

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Just replace the URL in the fetch_rss line below with the RSS feed to your Twitter favorites. In fact this will work with any RSS feed.

<?php
    include_once(ABSPATH . WPINC . '/feed.php');
    $rss = fetch_feed('http://twitter.com/favorites/793830.rss');
    $maxitems = $rss->get_item_quantity(3); 
    $rss_items = $rss->get_items(0, $maxitems);
?>

<ul>
    <?php if ($maxitems == 0) echo '<li>No items.</li>';
    else
    // Loop through each feed item and display each item as a hyperlink.
    foreach ( $rss_items as $item ) : ?>
    <li>
        <a href='<?php echo $item->get_permalink(); ?>'>
            <?php echo $item->get_title(); ?>
        </a>
    </li>
    <?php endforeach; ?>
</ul>

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Shortcodes in WordPress are bits of text you can use in the content area to invoke some kind of function to accomplish certain tasks. For example, video embedding in WP 2.9+ uses the shortcode. You can write your own shortcodes, and plugins often offer their functionality via shortcodes as well.

But what if you want to use a shortcode from within a template instead of with the content of a Post/Page? You can invoke it with a special function:

<?php echo do_shortcode("[shortcode]"); ?>

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For functions.php

 /* Shortcode to display an action button. */
add_shortcode( 'action-button', 'action_button_shortcode' );
function action_button_shortcode( $atts ) {
       extract( shortcode_atts(
               array(
                       'color' => 'blue',
                       'title' => 'Title',
                       'subtitle' => 'Subtitle',
                       'url' => ''
               ),
               $atts
       ));
       return '<span class="action-button ' . $color . '-button"><a href="' . $url . '">' . $title . '<span class="subtitle">' . $subtitle . '</span>' . '</a></span>';
}

Usage in Post Editor

[action-button color="blue" title="Download Now" subtitle="Version 1.0.1 – Mac OSX" url="#"]

CSS for style.css file

Only includes "blue" styling, add others as you might.

.action-button a:link, .action-button a:visited {
       border-radius: 5px;
       display: inline-block;
       font: 700 16px Arial, Sans-Serif;
       margin: 0 10px 20px 0;
       -moz-border-radius: 5px;
       padding: 14px 18px;
       text-align: center;
       text-decoration: none;
       text-shadow: 0 1px 1px rgba(0,0,0,0.3);
       text-transform: uppercase;
       -webkit-border-radius: 5px;
}

.action-button .subtitle {
       display: block;
       font: 400 11px Arial, Sans-Serif;
       margin: 5px 0 0;
}

.blue-button a:link, .blue-button a:visited {
       background-color: #5E9CB9;
       background-image: -moz-linear-gradient(top, #5E9CB9, #4E7E95);
       background-image: -webkit-gradient(linear, left top, left bottom, from(#5E9CB9), to(#4E7E95));
       color: #FFF;
       filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#5E9CB9', EndColorStr='#4E7E95');
       -ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorStr='#5E9CB9', EndColorStr='#4E7E95')";
}

.blue-button a:hover {
       background-color: #68A9C8;
       background-image: -moz-linear-gradient(top, #68A9C8, #598EA8);
       background-image: -webkit-gradient(linear, left top, left bottom, from(#68A9C8), to(#598EA8));
       color: #FFF;
       filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#68A9C8', EndColorStr='#598EA8');
       -ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorStr='#68A9C8', EndColorStr='#598EA8')";
}

Sent in by Matt Adams.

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<?php query_posts('cat=5'); ?>
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
   <?php the_content(); ?>
<?php endwhile; endif; ?>

If you were to use this, for example, in a left sidebar which ran before the main loop on your page, remember to reset the query or it will upset that main loop.

<?php wp_reset_query(); ?>

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