Site-Specific WordPress Plugin Template (shortcodes)

plugin-template(shortcodes).php

<?php
/*
Plugin Name: Template Site Plugin for example.com
Description: Site specific plugin template for example.com, in this case we are creating a widget
*/
////////////////////////////////////////////
// Start Adding Functions Below this Line //
////////////////////////////////////////////

/* self-closing shortcode */
function prefixname1_shortcode() {
  /* do something that outputs at that point where the shortcode is placed */
  return 'I am something that is placed in place where the shortcode used to be.';
}
add_shortcode('shortcodename1', 'prefixname1_shortcode');

/* usage: [shortcodename1] */


/* self-closing shortcode with parameters */
function button_shortcode($type) {
  extract(shortcode_atts(array(
    'type' => 'type'
  ), $type));

  // check what type user entered
  switch ($type) {
    case 'twitter':
      return '<a href="http://twitter.com/twitterusername" class="twitter-button">Follw me on Twitter!</a>';
      break;
    case 'rss':
      return '<a href="http://example.com/rss" class="rss-button">Subscribe to the feed!</a>'
      break;
  }
}
add_shortcode('button', 'button_shortcode');

/* usage
[button type="twitter"]
[button type="rss"]
*/

/* enclosing shortcode with parameters */
function button_shortcode( $atts, $content = null ) {
   extract( shortcode_atts( array(
    'account' => 'account',
    'style' => 'style'
    ), $atts ) );

   return '<a href="http://twitter.com/' . esc_attr($account) . '" class="twitter-button ' . esc_attr($style) . '">' . $content . '</a>';
}
add_shortcode('button', 'button_shortcode');

/* usage
[button account="twitterusername" style="simple"]Follow me on Twitter![/button]
/* results
<a href="http://twitter.com/twitterusername" class="twitter-button simple">Follow me on Twitter!</a>
*/

/* code in posts */
function code_shortcode( $attr, $content = null ) {
    $content = clean_pre($content); // Clean pre-tags
    return '<pre"><code>' .
         str_replace('<', '<', $content) . // Escape < chars
         '</code></pre>';
}
add_shortcode('code', 'code_shortcode');

/* usage [code]<?php echo 'Hello World!'; ?>[/code] */

/* private note to authors */
function sc_note( $atts, $content = null ) {
   if ( current_user_can( 'publish_posts' ) )
  return '<div class="note">'.$content.'</div>';
  return '';
}
add_shortcode( 'note', 'sc_note' );

/* usage [note]Psst! This is just for authors.[/note] */

///////////
// Other //
///////////

/* use shortcodes in a widget */
add_filter('widget_text', 'do_shortcode')

/* use shortcodes in php files directly */
do_shortcode("[button]");

///////////////////////////////////////////
// Stop adding functions below this line //
///////////////////////////////////////////
?>