Shortcode for Embedding a Twitch.tv Stream Chat - Used in DobsonDev Shortcodes Plugin for WordPress

embedTwitchChat-shortcode.php

<?php

/* Adds a shortcode to embed a Twitch Stream's chat */
function dobson_embed_twitch_chat($atts) {
  extract(shortcode_atts(array(
    'username' => "Invalid Username",
    'width' => "350",
    'height' => "500",
  ), $atts));
  $source_headers = @get_headers("http://twitch.tv/chat/embed?channel=" . $username . "&popout_chat=true");
  if (strpos($source_headers[0], '404 Not Found')) {
    return '<p> Invalid Twitch channel name. Please check your username and channel settings on Twitch to make '
    . 'sure they are setup correctly. </p>';
  } else {
    return '<iframe frameborder="0" scrolling="no" id="chat_embed" src="http://twitch.tv/chat/embed?channel='
    . $username . '&popout_chat=true" height="' . $height . '" width="' . $width . '"></iframe>';
  }
}
add_shortcode('embedTwitchChat', 'dobson_embed_twitch_chat');

?>