PHP 函数中的 WordPress 简码不起作用

我对PHP相当陌生，但在过去18年创建网站的过程中，我在HTML和CSS方面拥有丰富的经验。我的问题是我需要在wordpress中创建一个函数，该函数也将在其中使用简码。我已经让它工作到函数中的短代码将仅显示文本而不执行其功能的程度。这是我到目前为止所拥有的：

function artistArea($atts, $content = null) {
   extract(shortcode_atts(array('number' => '#', 'photo' => '#', 'name' => '#', 'video' => '#', 'audio' => '#', 'gallery' => '#', 'bio' => '#', 'element1' => '#','element2' => '#','element3' => '#','element4' => '#'), $atts));  
    switch ($number) {
        case '1' :
            $element1 = '1';
            $element2 = '2';
            $element3 = '3';
            $element4 = '4';
            break;
        case '2' :
            $element1 = '5';
            $element2 = '6';
            $element3 = '7';
            $element4 = '8';
            break;
        case '3' :
            $element1 = '9';
            $element2 = '10';
            $element3 = '11';
            $element4 = '12';
            break;
        case '4' :
            $element1 = '13';
            $element2 = '14';
            $element3 = '15';
            $element4 = '16';
            break;
        case '5' :
            $element1 = '17';
            $element2 = '18';
            $element3 = '19';
            $element4 = '20';
            break;
        default :
            $element1 = '1';
            $element2 = '2';
            $element3 = '3';
            $element4 = '2';
            break;
        break;
    }
        switch ($audio) {
        case '0' :
            $audioSection = ''; break;
        default :
            $audioSection = '
        <div class="artists_audio">
            <a class="lbp-inline-link-'.$element2.' cboxElement" href="#">AUDIO</a>
            <div style="display: none;"><div id="lbp-inline-href-'.$element2.'" style="padding:10px; background: #fff;">[soundcloud url="'.$audio.'" params="" width=" 100%" height="166" iframe="true" /]</div></div>
        </div>'; break;
        break;
    }
        switch ($video) {
        case '0' :
            $videoSection = ''; break;
        default :
            $videoSection = '       <div class="artists_video">
            <a class="lbp-inline-link-'.$element1.' cboxElement" href="#">VIDEO</a>
            <div style="display: none;"><div id="lbp-inline-href-'.$element1.'" style="padding:10px; background: #fff;">'.$video.'</div></div>
        </div>'; break;
        break;
    }
        switch ($gallery) {
        case '0' :
            $gallerySection = ''; break;
        default :
            $gallerySection = '                 <div class="artists_pictures">
            <a class="lbp-inline-link-'.$element3.' cboxElement" href="#">PICTURES</a>
            <div style="display: none;"><div id="lbp-inline-href-'.$element3.'" style="padding:10px; background: #fff;">[nggallery id='.$gallery.']</div></div>
        </div>'; break;
        break;
    }   

   return'<div class="artist_enclosure">
    <div class="artists_photo">
        <img src="'.$photo.'" alt="'.$name.'" width="150" height="150" class="alignnone size-thumbnail wp-image-39" />
    </div>
    <div class="artists_name"> 
        '.$name.'
    </div>
    <div class="artists_bio">
        '.$bio.'
    </div>
    <div class="artists_media">
        '.$videoSection.'
        '.$audioSection.'
        '.$gallerySection.'
        <div class="artists_booknow">
            <a class="lbp-inline-link-'.$element4.' cboxElement" href="#">BOOK NOW!</a>
            <div style="display: none;"><div id="lbp-inline-href-'.$element4.'" style="padding:10px; background: #fff;">[contact-form-7 id="4" title="Lounge Artists"]</div></div>
        </div>
    </div>
</div>
    ';
}
add_shortcode('artist', 'artistArea');

这是我在一个页面中发布的简码，除了视频、音频和图库部分外，该页面运行良好。

[artist number="1" photo="http://www.classiccabaret.com.au/wp-content/uploads/2013/08/moniique-e1376982930857-150x150.jpg" name="Monique Hebrard" bio="Energetic and versatile, Monique is a multi-talented singer, saxophonist, actress, and dancer. Monique has vast experience in hotel and corporate events. Her musical repertoire covers a variety of Jazz, Latin, Pop, Blues, Funk, RnB, and African." video="http://www.youtube.com/watch?v=0cDK2HTLbYg" audio="0" gallery="7" ]

如果有人能帮忙解决这个问题，那将不胜感激。