<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.

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WordPress lacks a wp_list_posts() function that might seem logical go with the robust and useful wp_list_pages() function. You can simulate it though, by using the get_posts() function and running your own loop through the results.

The parameters for get_posts() below are just examples, replace with your needs.

<ul>

    <?php
        $lastposts = get_posts('numberposts=5&orderby=rand&cat=-52');
        foreach($lastposts as $post) :
        setup_postdata($post); ?>

        <li<?php if ( $post->ID == $wp_query->post->ID ) { echo ' class="current"'; } else {} ?>>
            
            <a href="<?php the_permalink() ?>"><?php the_title(); ?></a>
            
        </li>

    <?php endforeach; ?>

</ul>

wp_list_pages() also has the feature of adding a class name of "current_page_item" to the list element when that page is the active one. Notice the opening list tag above, which replicates that functionality by seeing if the ID from the current query matches the ID from the current iteration of the loop.

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For your functions.php file or a functionality plugin:

function html5_insert_image($html, $id, $caption, $title, $align, $url) {
  $html5 = "<figure id='post-$id media-$id' class='align-$align'>";
  $html5 .= "<img src='$url' alt='$title' />";
  if ($caption) {
    $html5 .= "<figcaption>$caption</figcaption>";
  }
  $html5 .= "</figure>";
  return $html5;
}
add_filter( 'image_send_to_editor', 'html5_insert_image', 10, 9 );

It also takes what you enter as a caption and inserts it within the <figure> tag as a <figcaption>. Example inserted code:

<figure id='post-18838 media-18838' class='align-none'>
  <img src='http://youresite.com/wp-content/uploads/2012/10/image.png' alt='Title of image'>
  <figcaption>Caption for image</figcaption>
</figure>

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For a simple plugin or functions.php file:

function html5_insert_image($html, $id, $caption, $title, $align, $url) {
  $html5 = "<figure id='post-$id media-$id' class='align-$align'>";
  $html5 .= "<img src='$url' alt='$title' />";
  if ($caption) {
    $html5 .= "<figcaption>$caption</figcaption>";
  }
  $html5 .= "</figure>";
  return $html5;
}
add_filter( 'image_send_to_editor', 'html5_insert_image', 10, 9 );

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The following is the best way to go about it. Add the following to the theme's functions.php file:

if (!is_admin()) add_action("wp_enqueue_scripts", "my_jquery_enqueue", 11);
function my_jquery_enqueue() {
   wp_deregister_script('jquery');
   wp_register_script('jquery', "http" . ($_SERVER['SERVER_PORT'] == 443 ? "s" : "") . "://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js", false, null);
   wp_enqueue_script('jquery');
}

Replace the URL with the location of what version of jQuery you want to use.

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<?php include (TEMPLATEPATH . '/your-file.php'); ?>

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There are built in conditional WordPress functions for testing for a page:

if ( is_page(2) ) {
  // stuff
}

Or for testing if a page is a child of a certain page:

if ( $post->post_parent == '2' ) {
  // stuff
}

But there is no built in function that combines these two things, which is a fairly common need. For example, loading a special CSS page for a whole "branch" of content. Like a "videos" page and all its children individual videos pages.

This function (add to functions.php file) creates new logical function to be used in this way:

function is_tree($pid) {      // $pid = The ID of the page we're looking for pages underneath
	global $post;         // load details about this page
	if(is_page()&&($post->post_parent==$pid||is_page($pid))) 
               return true;   // we're at the page or at a sub page
	else 
               return false;  // we're elsewhere
};

Usage

if (is_tree(2)) {
   // stuff
}

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<?php
	$url = explode('/',$_SERVER['REQUEST_URI']);
	$dir = $url[1] ? $url[1] : 'home';
?>

<body id="<?php echo $dir ?>">

This would turn http://domain.tld/blog/home into "blog" (the second level of the URL structure). If at the root, it will return "home".

Here is an alternate method:

<?php
       $page = $_SERVER['REQUEST_URI'];
       $page = str_replace("/","",$page);
       $page = str_replace(".php","",$page);
       $page = str_replace("?s=","",$page);
       $page = $page ? $page : 'index'
?>

This would turn http://domain.tld/blog/home into "domaintldbloghome", which is far more specific. It also will remove ".php" file extensions and the default WordPress search parameter.

More Secure Method

function curr_virtdir($echo=true){
        $url = explode('/',$_SERVER['REQUEST_URI']);
        $dir = $url[1] ? $url[1] : 'home'; // defaults to this if in the root
        $dir = htmlentities(trim(strip_tags($dir))); // prevent injection into the DOM through this function
        if ($echo) echo $dir;
        return echo $dir; // ie. curr_virtdir(false)
}
function get_curr_virtdir(){
        curr_virtdir(false);
}

Returns the "middle" directory value:

On http://css-tricks.com it would return "home"
On http://css-tricks.com/snippets it would return "snippets"
On http://css-tricks.com/forums/viewforum.php?f=6 it would return "forums"

The strip_tags() and htmlentities() functions prevent malicious code from being insterted into the URL and ran, e.g.

<body id="foo"><script>alert("Booo");</script>

Usage for IDing the body:

<body id="<?php curr_virtdir(); ?>">

Other usage:

<?php
  if ( get_curr_virtdir() == "store" ){
    echo "Welcome to our awesome store !";
  } elseif ( get_curr_virtdir() == "home" ){
    echo "Welcome home :-)";
  } else {
    echo "Welcome on some other page";
  }
?>

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Might as well keep your header.php clean and insert the shim from the functions.php file.

// add ie conditional html5 shim to header
function add_ie_html5_shim () {
    echo '<!--[if lt IE 9]>';
    echo '<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>';
    echo '<![endif]-->';
}
add_action('wp_head', 'add_ie_html5_shim');

The shim is to enable HTML5 elements to be able to be styled through CSS in Internet Explorer versions less than 9.

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Let's say you wanted to use the post thumbnail feature of WordPress, but had a whole archive of posts that would take too much time to go through. For new posts, you can be specific and use the feature as intended. For old posts, you just want to use the first image it finds in the content for the thumbnail, or a default if none present.

Add this to functions.php or make a functionality plugin:

function catch_that_image() {
  global $post, $posts;
  $first_img = '';
  ob_start();
  ob_end_clean();
  $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
  $first_img = $matches[1][0];

  if(empty($first_img)) {
    $first_img = "/path/to/default.png";
  }
  return $first_img;
}

To use it, use this code in the loop:

if ( get_the_post_thumbnail($post_id) != '' ) {

  echo '<a href="'; the_permalink(); echo '" class="thumbnail-wrapper">';
   the_post_thumbnail();
  echo '</a>';

} else {

 echo '<a href="'; the_permalink(); echo '" class="thumbnail-wrapper">';
 echo '<img src="';
 echo catch_that_image();
 echo '" alt="" />';
 echo '</a>';

}

I found that has_post_thumbnail wasn't as reliable as the logic above.

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Add to functions.php file:

function get_ID_by_page_name($page_name) {
   global $wpdb;
   $page_name_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE post_name = '".$page_name."' AND post_type = 'page'");
   return $page_name_id;
}

Now you can use this function in templates when you need an ID of a specific post/page and all you have is the name.

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Post thumbnails are pretty useful and pretty easy to use in WordPress. Simply add:

add_theme_support('post-thumbnails'); 

To a theme's functions.php file and you'll get a Featured Image module on the admin screen for posts which allows you to select one.

It is also very easy to output that image as an HTML <img>:

the_post_thumbnail();

But what if you just need the URL? Say, you're going to use it as a background-image on an element rather than a content image. Unfortunately there is no super easy/obvious function for that.

Within the loop, you'll have to do:

$thumb_id = get_post_thumbnail_id();
$thumb_url_array = wp_get_attachment_image_src($thumb_id, 'thumbnail-size', true);
$thumb_url = $thumb_url_array[0];

Then $thumb_url will be that URL.

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Apparently there is no succinct WordPress function for just returning the content of a particular page by the ID of that page. This is that.

function get_the_content_by_id($post_id) {
  $page_data = get_page($post_id);
  if ($page_data) {
    return $page_data->post_content;
  }
  else return false;
}

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This will find what the ID is of the top-most parent Page, in a nested child page. For example, this page you are literally looking at is nested under

<?php

if ($post->post_parent)	{
	$ancestors=get_post_ancestors($post->ID);
	$root=count($ancestors)-1;
	$parent = $ancestors[$root];
} else {
	$parent = $post->ID;
}

?>

$parent will be the correct ID. For example, for use with wp_list_pages.

Source: CSSGlobe

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Some very easy copy-and-paste code here to add to the template for blog posts to allow for Facebook "liking" of the article. Probably best in the single.php template underneath where it outputs the content of the post.

<iframe src="http://www.facebook.com/plugins/like.php?href=<?php echo rawurlencode(get_permalink()); ?>&amp;layout=standard&amp;show-faces=true&amp;width=450&amp;action=like&amp;font=arial&amp;colorscheme=light" scrolling="no" frameborder="0" allowTransparency="true" id="facebook-like"></iframe>

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For your functions.php file in the theme.

add_theme_support( 'post-formats', 
	array( 
		'aside', 
		'gallery',
		'link',
		'image',
		'quote',
		'status',
		'video',
		'audio',
		'chat'
	) 
);
add_post_type_support( 'post', 'post-formats' );
add_post_type_support( 'page', 'post-formats' );
// and other custom post types if you have them

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<?php $recent = new WP_Query("page_id=**ID**"); while($recent->have_posts()) : $recent->the_post();?>
       <h3><?php the_title(); ?></h3>
       <?php the_content(); ?>
<?php endwhile; ?>

The above code can be used within the regular page loop. Replace **ID** with the ID of the page you wish to embed.

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<title>
   <?php 
      if (function_exists('is_tag') && is_tag()) { 
         single_tag_title("Tag Archive for &quot;"); echo '&quot; - '; } 
      elseif (is_archive()) { 
         wp_title(''); echo ' Archive - '; } 
      elseif (is_search()) { 
         echo 'Search for &quot;'.wp_specialchars($s).'&quot; - '; } 
      elseif (!(is_404()) && (is_single()) || (is_page())) { 
         wp_title(''); echo ' - '; } 
      elseif (is_404()) { 
         echo 'Not Found - '; } 
      if (is_home()) { 
         bloginfo('name'); echo ' - '; bloginfo('description'); } 
      else {
          bloginfo('name'); }
      if ($paged>1) { 
         echo ' - page '. $paged; } 
   ?>
</title>

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WordPress has a built in function, the_meta(), for outputting all custom fields. But this function is limited in that it doesn't always output all of them. For example, it misses custom fields added by plugins which begin with an _ underscore.

This bit of code uses an alternate function, get_post_custom() which will return all of them, and display all values. Good for debugging.

<h3>All Post Meta</h3>

<?php $getPostCustom=get_post_custom(); // Get all the data ?>

<?php
    foreach($getPostCustom as $name=>$value) {

        echo "<strong>".$name."</strong>"."  =>  ";

        foreach($value as $nameAr=>$valueAr) {
                echo "<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;";
                echo $nameAr."  =>  ";
                echo var_dump($valueAr);
        }

        echo "<br /><br />";

    }
?>

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Right before the closing of the The Loop, insert this code:

<?php
if (($wp_query->current_post + 1) < ($wp_query->post_count)) {
   echo '<div class="post-item-divider">Post Divider</div>';
}
?>

This will create a <div> you can style as a post divider. The cool part being, it only gets inserted between two posts, skipping the last one. Thanks to Craig Maclean.

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<?php
$posttags = get_the_tags(); // Get articles tags
$home = get_bloginfo('url'); // Get homepage URL

// Check tagslug.png exists and display it
if ($posttags) {
 foreach($posttags as $tag) {
       $image = "http://cdn.css-tricks.com/images/tag-images/$tag->slug.png";

       if (file_exists("images/tag-images/$tag->slug.png")) {
         echo '<a href="' . $home . '/tag/' . $tag->slug . '" /><img title="' . $tag->name . '" alt="' . $tag->name . '" src="' . $image . '" /></a>';

       // If no image found, output something else, possibly nothing.
       } else {
         echo '<p>Not found</p>';
       }
  }
}
?>

This code belongs inside the loop. It will look in a specific directory for any images that match the slugs of article tags, display them and link them to the relevant tag archive.

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The image that shows for the author comes from the email address set for that user which goes to a corresponding Gravatar. The display name and bio come from the User settings area in the Admin.

<div class="author-box">
   <div class="author-pic"><?php echo get_avatar( get_the_author_email(), '80' ); ?></div>
   <div class="author-name"><?php the_author_meta( "display_name" ); ?></div>
   <div class="author-bio"><?php the_author_meta( "user_description" ); ?></div>
</div>

That should be all the CSS hooks you need to style up the area however you want. Note: some of these functions are WordPress 2.8 and newer only.

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<?php wp_tag_cloud( array(

    'smallest' => 8,          // font size for the least used tag
    'largest'  => 22,         // font size for the most used tag
    'unit'     => 'px',       // font sizing choice (pt, em, px, etc)
    'number'   => 45,         // maximum number of tags to show
    'format'   => 'flat',     // flat, list, or array. flat = spaces between; list = in li tags; array = does not echo results, returns array
    'orderby'  => 'name',     // name = alphabetical by name; count = by popularity
    'order'    => 'ASC',      // starting from A, or starting from highest count
    'exclude'  => 12,         // ID's of tags to exclude, displays all except these
    'include'  => 13,         // ID's of tags to include, displays none except these
    'link'     => 'view',     // view = links to tag view; edit = link to edit tag
    'taxonomy' => 'post_tag', // post_tag, link_category, category - create tag clouds of any of these things
    'echo'     => true        // set to false to return an array, not echo it

) ); ?>

The default sizing, if none supplied, for this function is "pt" which is a bit unusual and often unreliable so make sure you change that parameter to how you size fonts normally on your site.

Less Weird Font Sizing

Tag clouds accomplish their varied font sizes by applying inline styling to each tag. The resulting font sizes can be really weird like style='font-size:29.3947354754px;'. Mike Summers proposes this solution:

<div id="tagCloud">
	<ul>
		<?php
			$arr = wp_tag_cloud(array(
				'smallest'             => 8,                      // font size for the least used tag
				'largest'                => 40,                    // font size for the most used tag
				'unit'                      => 'px',                 // font sizing choice (pt, em, px, etc)
				'number'              => 200,                 // maximum number of tags to show
				'format'                => 'array',            // flat, list, or array. flat = spaces between; list = in li tags; array = does not echo results, returns array
				'separator'          => '',                      //
				'orderby'              => 'name',           // name = alphabetical by name; count = by popularity
				'order'                   => 'RAND',          // starting from A, or starting from highest count
				'exclude'              => '',                      // ID's of tags to exclude, displays all except these
				'include'               => '',                      // ID's of tags to include, displays none except these
				'link'                       => 'view',             // view = links to tag view; edit = link to edit tag
				'taxonomy'         => 'post_tag',    // post_tag, link_category, category - create tag clouds of any of these things
				'echo'                    => true                 // set to false to return an array, not echo it
			));
			foreach ($arr as $value) {
				$ptr1 = strpos($value,'font-size:');
				$ptr2 = strpos($value,'px');
				$px = round(substr($value,$ptr1+10,$ptr2-$ptr1-10));
				$value = substr($value, 0, $ptr1+10) . $px . substr($value, $ptr2);
				$ptr1 = strpos($value, "class=");
				$value = substr($value, 0, $ptr1+7) . 'color-' . $px . ' ' . substr($value, $ptr1+7);
				echo '<li>' . $value . '</li> ';
			}
		?>
	</ul>
</div>

The result turns this:

<a href='url' class='tag-link-66' title='6 topics' style='font-size:29.3947354754px;'>Tag Name</a>

into this:

<a href='url' class='color-29 tag-link-66' title='6 topics' style='font-size:29px;'>Tag Name</a>

Notice the added bonus that the links has a class name of "color-29" now that it didn't before. Now you have a hook to colorize tag names based on their size.

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function my_formatter($content) {
       $new_content = '';
       $pattern_full = '{(\[raw\].*?\[/raw\])}is';
       $pattern_contents = '{\[raw\](.*?)\[/raw\]}is';
       $pieces = preg_split($pattern_full, $content, -1, PREG_SPLIT_DELIM_CAPTURE);

       foreach ($pieces as $piece) {
               if (preg_match($pattern_contents, $piece, $matches)) {
                       $new_content .= $matches[1];
               } else {
                       $new_content .= wptexturize(wpautop($piece));
               }
       }

       return $new_content;
}

remove_filter('the_content', 'wpautop');
remove_filter('the_content', 'wptexturize');

add_filter('the_content', 'my_formatter', 99);

This goes in the PHP in your functions.php file. Once done, you can use the [raw] shortcode in your posts: [raw]Unformatted code[/raw]

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Add to functions.php file

remove_filter('the_content', 'wptexturize');
remove_filter('the_excerpt', 'wptexturize');
remove_filter('comment_text', 'wptexturize');
remove_filter('the_title', 'wptexturize');

the wptexturize function is responsible for lots of automatic alterations to text stored in WordPress like automatic elipses (...), em and en dashes, typographers quotes, etc.

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Just post a link to a GitHub Gist and it will be nicely embedded. Or use the format this snippet provides and create the shortcode yourself. For your functions.php file:

<?php
// [gist id="ID" file="FILE"]
function gist_shortcode($atts) {
  return sprintf(
    '<script src="https://gist.github.com/%s.js%s"></script>', 
    $atts['id'], 
    $atts['file'] ? '?file=' . $atts['file'] : ''
  );
} add_shortcode('gist','gist_shortcode');

// Remove this function if you don't want autoreplace gist links to shortcodes
function gist_shortcode_filter($content) {
  return preg_replace('/https:\/\/gist.github.com\/([\d]+)[\.js\?]*[\#]*file[=|_]+([\w\.]+)(?![^<]*<\/a>)/i', '[gist id="${1}" file="${2}"]', $content );
} add_filter( 'the_content', 'gist_shortcode_filter', 9);
?>

Any of these formats will work:

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You know, the one typically at yoursite.com/wp-login.php. These are things you would put in the active theme's functions.php file.

Change the Logo

Is the WordPress logo by default, this changes the file path of that image. Change file path and file name to your own needs.

function custom_login_logo() {
	echo '<style type="text/css">h1 a { background: url('.get_bloginfo('template_directory').'http://cdn.css-tricks.com/images/logo-login.gif) 50% 50% no-repeat !important; }</style>';
}
add_action('login_head', 'custom_login_logo');

Change the URL

... of where clicking that logo goes. By default it goes to WordPress.org, this will change it to your own homepage.

function change_wp_login_url() {
	return bloginfo('url');
}
add_filter('login_headerurl', 'change_wp_login_url');

Change the Title

That is, change the title attribute of the image you just replaced. This changes it to the name of your blog in the settings.

function change_wp_login_title() {
	return get_option('blogname');
}
add_filter('login_headertitle', 'change_wp_login_title');

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In a typical WordPress theme you output the entire list of comments for a Post/Page by using the function wp_list_comments(). This doesn't offer much by the way of customizing what HTML markup gets generated for that comment list. To write your own markup for the comment list, you can use a callback function as a parameter in wp_list_comments(), so it's just as nicely abstracted.

In functions.php

<?php
function my_custom_comments($comment, $args, $depth) {
   $GLOBALS['comment'] = $comment; ?>
   <li <?php comment_class(); ?> id="li-comment-<?php comment_ID() ?>">
   <?php if ($comment->comment_approved == '0') : ?>
      <em><?php _e('Your comment is awaiting moderation.') ?></em>
   <?php endif; ?>

   // Comments markup code here, e.g. functions like comment_text(); 

}
?>

In comments.php

<?php 
   wp_list_comments("callback=my_custom_comments"); 
?>

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The wp_list_comments function has a parameter to change the default (48px) size to anywhere between 0 and 80px.

wp_list_comments('avatar_size=80');

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The bloginfo() function in WordPress gives you access to lots of useful information about your site. See the complete list. To access all these values from inside Page/Post content itself, we can make a shortcode to return the values. Add this to your functions.php file in your theme:

function digwp_bloginfo_shortcode( $atts ) {
   extract(shortcode_atts(array(
       'key' => '',
   ), $atts));
   return get_bloginfo($key);
}
add_shortcode('bloginfo', 'digwp_bloginfo_shortcode');

Now you can output any of the values by calling that shortcode with "key". For example, the name of your site:

[bloginfo key='name']

Or directly to images in your theme folder:

<img src="[bloginfo key='template_url']/images/logo.jpg" alt="[bloginfo key='name'] logo" />

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ol.commentlist { list-style:none; margin:0 0 1em; padding:0; text-indent:0; }
ol.commentlist li { }
ol.commentlist li.alt { }
ol.commentlist li.bypostauthor {}
ol.commentlist li.byuser {}
ol.commentlist li.comment-author-admin {}
ol.commentlist li.comment { border-bottom:1px dotted #666; padding:1em; }
ol.commentlist li.comment div.comment-author {}
ol.commentlist li.comment div.vcard { font:normal 16px georgia,times,serif; }
ol.commentlist li.comment div.vcard cite.fn { font-style:normal; }
ol.commentlist li.comment div.vcard cite.fn a.url {}
ol.commentlist li.comment div.vcard img.avatar { border:5px solid #ccc; float:right; margin:0 0 1em 1em; }
ol.commentlist li.comment div.vcard img.avatar-32 {}
ol.commentlist li.comment div.vcard img.photo {}
ol.commentlist li.comment div.vcard span.says {}
ol.commentlist li.comment div.commentmetadata {}
ol.commentlist li.comment div.comment-meta { font-size:9px; }
ol.commentlist li.comment div.comment-meta a { color:#ccc; }
ol.commentlist li.comment p { font-size:11px; margin:0 0 1em; }
ol.commentlist li.comment ul { font-size:11px; list-style:square; margin:0 0 1em 2em; }
ol.commentlist li.comment div.reply { font-size:11px; }
ol.commentlist li.comment div.reply a { font-weight:bold; }
ol.commentlist li.comment ul.children { list-style:none; margin:1em 0 0; text-indent:0; }
ol.commentlist li.comment ul.children li {}
ol.commentlist li.comment ul.children li.alt {}
ol.commentlist li.comment ul.children li.bypostauthor {}
ol.commentlist li.comment ul.children li.byuser {}
ol.commentlist li.comment ul.children li.comment {}
ol.commentlist li.comment ul.children li.comment-author-admin {}
ol.commentlist li.comment ul.children li.depth-2 { border-left:5px solid #555; margin:0 0 .25em .25em; }
ol.commentlist li.comment ul.children li.depth-3 { border-left:5px solid #999; margin:0 0 .25em .25em; }
ol.commentlist li.comment ul.children li.depth-4 { border-left:5px solid #bbb; margin:0 0 .25em .25em; }
ol.commentlist li.comment ul.children li.depth-5 {}
ol.commentlist li.comment ul.children li.odd {}
ol.commentlist li.even { background:#fff; }
ol.commentlist li.odd { background:#f6f6f6; }
ol.commentlist li.parent { border-left:5px solid #111; }
ol.commentlist li.thread-alt { }
ol.commentlist li.thread-even {}
ol.commentlist li.thread-odd {}

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This would go inside the loop, probably underneath the_content(), probably in your single.php file.

// bookmark on Delicious
<a rel="nofollow" href="http://delicious.com/post?url=<?php the_permalink(); ?>&amp;title=<?php echo urlencode(get_the_title($id)); ?>" title="Bookmark this post at Delicious">Bookmark at Delicious</a>

// submit to Digg
<a rel="nofollow" href="http://digg.com/submit?phase=2&amp;url=<?php the_permalink(); ?>" title="Submit this post to Digg">Digg this!</a>

// tweet on Twitter
<a rel="nofollow" href="http://twitter.com/home?status=<?php echo urlencode("Currently reading: "); ?><?php the_permalink(); ?>" title="Share this article with your Twitter followers">Tweet this!</a>

// submit to StumbleUpon
<a rel="nofollow" href="http://www.stumbleupon.com/submit?url=<?php the_permalink(); ?>&amp;title=<?php echo urlencode(get_the_title($id)); ?>" title="Share this post at StumbleUpon">Stumble this!</a>

// share on Facebook
<a rel="nofollow" href="http://www.facebook.com/sharer.php?u=<?php the_permalink();?>&amp;t=<?php echo urlencode(get_the_title($id)); ?>" title="Share this post on Facebook">Share on Facebook</a>

// submit to Blinklist
<a rel="nofollow" href="http://blinklist.com/index.php?Action=Blink/addblink.php&amp;url=<?php the_permalink(); ?>&amp;Title=<?php echo urlencode(get_the_title($id)); ?>" title="Share this post on Blinklist" >Blink This!</a>

// store on Furl
<a rel="nofollow" href="http://furl.net/storeIt.jsp?t=<?php echo urlencode(get_the_title($id)); ?>&amp;u=<?php the_permalink(); ?>" title="Share this post on Furl">Furl This!</a>

// submit to Reddit
<a rel="nofollow" href="http://reddit.com/submit?url=<?php the_permalink(); ?>&amp;title=<?php echo urlencode(get_the_title($id)); ?>" title="Share this post on Reddit">Share on Reddit</a>

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Add to the functions.php file:

add_action('admin_head', 'my_custom_fonts');

function my_custom_fonts() {
  echo '<style>
    body, td, textarea, input, select {
      font-family: "Lucida Grande";
      font-size: 12px;
    } 
  </style>';
}

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For your functions.php file or a functionality plugin:

function cc_mime_types( $mimes ){
	$mimes['svg'] = 'image/svg+xml';
	return $mimes;
}
add_filter( 'upload_mimes', 'cc_mime_types' );

Without this, SVG files will be rejected when attempting to upload them through the media uploader.

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<?php if (current_user_can("manage_options")) : ?>
       <a href="<?php echo bloginfo("siteurl") ?>/wp-admin/">Admin</a>
<?php endif; ?>

If a user is logged in and they are an Admin of the site (not just an subscriber or author), then display a link to get them to the WordPress Admin area. Otherwise, display nothing.

More specific than the regular log in / log out function, which will show for everyone:

<?php wp_loginout(); ?>

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User profiles in WordPress by default have these fields for Contact Info by default: E-mail, Website, AIM, Yahoo IM, Jabber / Google Talk. You can remove those and add new ones as you wish, like in this example code for your functions.php file in your theme:

function new_contactmethods( $contactmethods ) {
   $contactmethods['twitter'] = 'Twitter'; // Add Twitter
   $contactmethods['facebook'] = 'Facebook'; // Add Facebook
   unset($contactmethods['yim']); // Remove YIM
   unset($contactmethods['aim']); // Remove AIM
   unset($contactmethods['jabber']); // Remove Jabber

   return $contactmethods;
}

To display that publicly, you could:

$user_id = 1;
$key = 'twitter';
$single = true;

$user_twitter = get_user_meta( $user_id, $key, $single); 

echo $user_twitter; 

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These two functions create anchor links, and you can customize a lot of it, but it's impossible to add a class through just using their parameters alone. Gotta add a function to functions.php:

add_filter('next_posts_link_attributes', 'posts_link_attributes');
add_filter('previous_posts_link_attributes', 'posts_link_attributes');

function posts_link_attributes() {
    return 'class="styled-button"';
}

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The body_class function is nice for adding a bunch of classes to the body tag that have information about what kind of page is currently being displayed. Probably for styling purposes. But for whatever reason, it doesn't include a class for the current category (or categories) for a single post.

This adds that category "nice" name:

add_filter('body_class','add_category_to_single');
function add_category_to_single($classes, $class) {
  if (is_single() ) {
    global $post;
    foreach((get_the_category($post->ID)) as $category) {
      // add category slug to the $classes array
      $classes[] = $category->category_nicename;
    }
  }
  // return the $classes array
  return $classes;
}

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<?php edit_post_link(__('Edit This')); ?>

Put this in the theme file somewhere near where you output the_content() (likely in the single.php or page.php file) to make a link you can click that takes you into the admin to edit it. This link will only be visible when the viewer is logged in and has appropriate permissions to edit that page (administrator or author).

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When you upload an image through the WordPress media uploader and then insert it into the editor, it comes with width and height attributes. These are normally desirable, as it assists the browser in making the appropriate room for the image during layout. But if you want to remove the insert action from adding these attributes, you can add this code to you functions.php file or a functionality plugin of your own making:

add_filter( 'post_thumbnail_html', 'remove_width_attribute', 10 );
add_filter( 'image_send_to_editor', 'remove_width_attribute', 10 );

function remove_width_attribute( $html ) {
   $html = preg_replace( '/(width|height)="\d*"\s/', "", $html );
   return $html;
}

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Setting Single Attribute

$("img").attr("src", "http://cdn.css-tricks.com/images/banner.jpg");

Setting Single Attribute (with function)

$("div").attr("id", function (arr) {
    return "div-id" + arr;
})

Setting Multiple Attributes

$("img").attr({
       src: "http://cdn.css-tricks.com/images/banner.jpg",
       title: "banner",
       alt: "banner"
});

Getting Attribute

var $source = $("img").attr("src");

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window.load can fire super duper fast if the page is cached. If you want to use that event but make sure a minimum amount of time has passed until it does...

(function fn() {

  fn.now = +new Date;

  $(window).load(function() {

     if (+new Date - fn.now < 500) setTimeout(fn, 500);
     
		 // Do something

  });

})();

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This snippet presupposed an HTML form with and ID of "age-form" and three inputs (text or select) with the IDs "day", "month", and "year" respectively.

$("#age-form").submit(function(){
	var day = $("#day").val();
	var month = $("#month").val();
	var year = $("#year").val();
	var age = 18;
	var mydate = new Date();
	mydate.setFullYear(year, month-1, day);

	var currdate = new Date();
	currdate.setFullYear(currdate.getFullYear() - age);
	if ((currdate - mydate) < 0){
		alert("Sorry, only persons over the age of " + age + " may enter this site");
		return false;
	}
	return true;
});

You may wish to do something more elegant than an alert, and should also probably validate the form with server side code or else this protection only works for users with JavaScript enabled.

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There is no CSS for applying an underline (text-decoration: underline;) only to individual words in a multiple-word element. The best way would be to wrap each word in a span (not the spaces, just the words) in spans and apply underline to those spans. Here's jQuery to do that to h1 elements.

$('h1').each(function() {

	var words = $(this).text().split(' ');

	$(this).empty().html(function() {

		for (i = 0; i < words.length; i++) {
			if (i == 0) {
				$(this).append('<span>' + words[i] + '</span>');
			} else {
				$(this).append(' <span>' + words[i] + '</span>');
			}
		}
	
	});

});

Then you could do:

h1 span {
  text-decoration: underline;
}

Similar and slightly more robust solution: Lettering.js

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$.event.special.tripleclick = {

    setup: function(data, namespaces) {
        var elem = this, $elem = jQuery(elem);
        $elem.bind('click', jQuery.event.special.tripleclick.handler);
    },

    teardown: function(namespaces) {
        var elem = this, $elem = jQuery(elem);
        $elem.unbind('click', jQuery.event.special.tripleclick.handler)
    },

    handler: function(event) {
        var elem = this, $elem = jQuery(elem), clicks = $elem.data('clicks') || 0;
        clicks += 1;
        if ( clicks === 3 ) {
            clicks = 0;

            // set event type to "tripleclick"
            event.type = "tripleclick";
            
            // let jQuery handle the triggering of "tripleclick" event handlers
            jQuery.event.handle.apply(this, arguments)  
        }
        $elem.data('clicks', clicks);
    }
    
};

Usage

$("#whatever").bind("tripleclick", function() {
   // do something
}

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Labels should have "for" attributes that match the ID of the input they are labeling. This means we can snag that attribute and use it in a selector to trigger a click on the input itself. Assuming of course you have some reason to watch for clicks on inputs.

var labelID;

$('label').click(function() {
       labelID = $(this).attr('for');
       $('#'+labelID).trigger('click');
});

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Sparkbox has this snippet to help figure out how often browser windows really are resized.

(function() {
  var resizeTimer;
  
  // Assuming we have jQuery present
  $( window ).on( "resize", function() {
    
    // Use resizeTimer to throttle the resize handler
    clearTimeout( resizeTimer );
    resizeTimer = setTimeout(function() {

     /* Send the event to Google Analytics
      *
      * https://developers.google.com/analytics/devguides/collection/gajs/methods/gaJSApiEventTracking
      * _trackEvent(category, action, opt_label, opt_value, opt_noninteraction)   
      */
      var $window = $( window );
      _gaq.push( [ "_trackEvent", "User Actions", "Browser Resize", $window.width() + " x " + $window.height() ] );
    }, 1000);
  });
})();

Note how easy it is to track events in Google Analytics. That can be used for just about anything.

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Let's say you have a link to show more options which expands a list of options. It's says "more options". It's easy to toggle those options with .toggle() or .slideToggle(), but the text remains the same. To toggle the text too...

$("#more-less-options-button").click(function() {
     var txt = $("#extra-options").is(':visible') ? 'more options' : 'less options';
     $("#more-less-options-button").text(txt);
     $("#extra-options").slideToggle();
});

There is a bunch of other ways, as well.

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In this example, a submit button is disabled if none of the checkboxes are checked and enabled if at least one is checked.

<form>
   <!-- bunch of checkboxes like: -->
   <input type="checkbox" ... >
   <input type="checkbox" ... >

   <!-- submit button, defaults to disabled -->
   <input type="submit" value="submit">
</form>

The trick is that you can use .is(":checked") on a jQuery object full of a bunch of elements and it'll return true if any of them are checked and false if none of them are. AND, using .attr() for the disabled attribute with that boolean value will enable/disable that button.

var checkboxes = $("input[type='checkbox']"),
    submitButt = $("input[type='submit']");

checkboxes.click(function() {
    submitButt.attr("disabled", !checkboxes.is(":checked"));
});

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Technique #1

$('a').filter(function() {
   return this.hostname && this.hostname !== location.hostname;
}).addClass("external");

Technique #2

$.expr[':'].external = function(obj) {
    return !obj.href.match(/^mailto\:/) && (obj.hostname != location.hostname);
};
$('a:external').addClass('external');

Technique #3

$('a:not([href^="http://your-website.com"]):not([href^="#"]):not([href^="/"])').addClass('external');

Technique #4

$('a').each(function() {
   var a = new RegExp('/' + window.location.host + '/');
   if (!a.test(this.href)) {
       // This is an external link
   }
});

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