For the functions.php file:

function year_shortcode() {
  $year = date('Y');
  return $year;
}
add_shortcode('year', 'year_shortcode');

Usage

Use [year] in your posts.

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Dump out all custom fields as a list

<?php the_meta(); ?>

Display value of one specific custom field

<?php echo get_post_meta($post->ID, 'mood', true); ?>

"mood" would be ID value of custom field

Display multiple values of same custom field ID

<?php $songs = get_post_meta($post->ID, 'songs', false); ?>
<h3>This post inspired by:</h3>
<ul>
	<?php foreach($songs as $song) {
		echo '<li>'.$song.'</li>';
	} ?>
</ul>

Display custom field only if exists (logic)

<?php 
    $url = get_post_meta($post->ID, 'snippet-reference-URL', true); 

	if ($url) {
	    echo "<p><a href='$url'>Reference URL</a></p>";
	}
?>

Reference URL

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Comment out the top line there, and add the rest to your wp-config.php file to get more detailed error reporting from your WordPress site. Definitely don't do this live, do it for local development and testing.

// define('WP_DEBUG', false);

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);
@ini_set('display_errors', 0);

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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 );

?>

Reference URL

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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');

?>

Reference URL

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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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Include Basic WordPress Functions

<?php
  // Include WordPress
  define('WP_USE_THEMES', false);
  require('/server/path/to/your/wordpress/site/htdocs/blog/wp-blog-header.php');
  query_posts('showposts=1');
?>

Run Loop

<?php while (have_posts()): the_post(); ?>
   <h2><?php the_title(); ?></h2>
   <?php the_excerpt(); ?>
   <p><a href="<?php the_permalink(); ?>" class="red">Read more...</a></p>
<?php endwhile; ?>

This can be used on any PHP file even OUTSIDE your WordPress installation.

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You'll need to be able to run SQL on that database, like for example, through phpMyAdmin.

UPDATE `wp_users` SET `user_pass` = MD5( 'new_password_here' ) WHERE `wp_users`.`user_login` = "admin_username";

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Forget your admin password and don't have access to the email account it's under? If you can get access to phpMyAdmin (or anything you can run mySQL commands), you can update it there.

UPDATE `wp_users` SET `user_pass` = MD5( 'new_password_here' ) WHERE `wp_users`.`user_login` = "admin_username";

Just replace new_password_here with the new password and admin_username with the real admin accounts usename.

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This is useful if you would like to replace the ellipsis [...] from the excerpt with a permalink to the post.

functions.php addition:

function replace_excerpt($content) {
       return str_replace('[...]',
               '<div class="more-link"><a href="'. get_permalink() .'">Continue Reading</a></div>',
               $content
       );
}
add_filter('the_excerpt', 'replace_excerpt');

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It can be considered a security risk to make your wordpress version visible and public you should hide it.

Put in functions.php file in your theme:

remove_action('wp_head', 'wp_generator');

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In WordPress, there are many functions which output things for you. For example, wp_list_pages() outputs a list of all your published pages. The HTML markup it spits out is pretty nicely formatted (meaning: has line breaks and indenting).

There are some circumstances where all that "whitespace" in the formatting is undesirable. Like 1) it's all the more characters to deliver and 2) closing "the gap" in older versions of IE.

If the function supports a way to return a string (rather than immediately echo it), you can use a regex to remove the space:

<?php
   echo preg_replace('/>\s+</m', '><', wp_list_pages('echo=0'));
?>

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For your functions.php file:

  add_action('get_header', 'my_filter_head');

  function my_filter_head() {
    remove_action('wp_head', '_admin_bar_bump_cb');
  }

By default, if you are seeing the admin bar as a logged in WordPress user, CSS like this will be output in your head (output in the wp_head() function):

<style type="text/css" media="screen">
	html { margin-top: 28px !important; }
	* html body { margin-top: 28px !important; }
</style>

This is normally a good thing, as it doesn't cover parts of your site then with its fixed-position-ness. But it can also be weird if you use absolute positioning for things. As they will be different depending on if the bar is there or not. Using the code above to remove the bump CSS will make the bar cover the top bit of your site, but at least the positioning will be consistent.

Reference URL

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<?php query_posts('cat=-3'); ?>

<?php if (have_posts()) : ?>

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

		<h3>














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