Tutorial Automatic Social Media Links

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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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Tutorial Apply Custom CSS to Admin Area

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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>';
}

Tutorial Allow SVG through WordPress Media Uploader

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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.

Tutorial Admin Panel Link Only For Admins

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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(); ?>

Tutorial Add/remove contact info fields

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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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Tutorial Add class to links generated by next_posts_link and previous_posts_link

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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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Tutorial Add Category Name to body_class

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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;
}