Youtube FrontPage Plugin

<?php

/*  Plugin Name: Youtube FrontPage
  Plugin URI: http://dolphinaura.com
  Description: This plugin sets the default frontpage youtube video.
  Version: 1.0
    Author: sandy(d)
    Author URI: http://dolphinaura.com
    License: GPL2
*/


?>
<?php
// create custom plugin settings menu
add_action('admin_menu', 'ytfront_create_menu');

function ytfront_create_menu() {

    //create new top-level menu
    add_menu_page('Youtube FrontPage Plugin Settings', 'Youtube Frontpage', 'administrator', 'ytfront', 'ytfront_settings_page');

    //call register settings function
    add_action( 'admin_init', 'register_mysettings' );
}


function register_mysettings() {
    //register our settings
    register_setting( 'ytfront-settings-group', 'ytfront_url' );
}

function ytfront_settings_page() {

?>
<div class="wrap">
<h2>Youtube FrontPage Plugin Settings</h2>

<form method="post" action="options.php">
    <?php settings_fields( 'ytfront-settings-group' ); ?>
    <?php do_settings_sections( 'ytfront-settings-group' ); ?>
    <table class="form-table">
        <tr>This controls the Youtube Video seen on the front page.</tr>
        <tr valign="top">
        <th scope="row">Youtube Link</th>
        <td><input type="text" name="ytfront_url" value="<?php echo get_option('ytfront_url'); ?>" /></td>
        </tr>
    </table>
    <h2>Video Preview</h2>
    <?php
        //Match all Youtube Links (excluding youtu.be short links)
        $videoUrl = get_option('ytfront_url');
        preg_match('%https?://(www\.)?youtube\.com/watch\?v=[^&]+.*%', $videoUrl, $matches);

        //youtu.be short links
        if (substr(get_option('ytfront_url'),0, 15) =="http://youtu.be") {
                $strippedurl=substr(get_option('ytfront_url'),16, strlen(get_option('ytfront_url')));?>
                <iframe width="560" height="315" src="http://www.youtube.com/embed/<?php echo substr(get_option('ytfront_url'),16, strlen(get_option('ytfront_url'))); ?>" frameborder="0" allowfullscreen></iframe>
            <?php }
        //Not a Youtube Link (Does not match regex)
        elseif (implode(',', $matches) == "") { ?>
                <h3>This video link is invalid</h3>
        <?php }
        //Youtube Links with stuff like "&feature=player_embedded" at the back.
        //Those are stripped.
        elseif (strpos(get_option('ytfront_url'),'&') !== false) {
            $strippedurl=substr(get_option('ytfront_url'), 0, strpos(get_option('ytfront_url'), '&'));?>
            <iframe width="560" height="315" src="http://www.youtube.com/embed/<?php echo substr($strippedurl, strpos($strippedurl, '=')+1, strlen($strippedurl)); ?>" frameborder="0" allowfullscreen></iframe>
         <?php
        }
        //Standard Youtube Links
        else {
            $strippedurl=substr(get_option('ytfront_url'), strpos(get_option('ytfront_url'), '=')+1, strlen(get_option('ytfront_url')));
            ?>
            <iframe width="560" height="315" src="http://www.youtube.com/embed/<?php echo $strippedurl ?>" frameborder="0" allowfullscreen></iframe>
       <?php } ?>


    <div style="text-align:right"><img src="https://s3-us-west-1.amazonaws.com/daura-static/img/sandyd_production.png" alt="sandyd_production" /></div>

    <p class="submit">
    <input type="submit" class="button-primary" value="<?php _e('Save Changes') ?>" />
    </p>

</form>
</div>
<?php }
?>