[WordPress] Embed YouTube videos using the shortcode [yt]

index.php

<?php

/*
Plugin Name: Youtube Shorty
Description: Embed YouTube videos using the shortcode [yt]
*/

function youtube_short($atts) 
  {
    if (!isset($atts['width'])) {$atts['width']="100%";}
    if (!isset($atts['height'])) {$atts['height']="400px";}
   
    $id = $atts['id'];
    $width=$atts['width'];
    $height=$atts['height'];

    $videosrc = "<iframe src=\"http://www.youtube.com/embed/" . $id . "\"  width= \"". $width . "\" height=\"" . $height . "frameborder=\"0\" allowfullscreen>" . "</iframe>" .
        "";

    return $videosrc;  
}

add_shortcode("yt", "youtube_short");



?>