YouTubeプラグイン

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<?php
/////////////////////////////////////////////////
 
function plugin_youtube_inline()
{
    $argc = func_num_args();
    $argv = func_get_args();
    
    $width  = 560;
    $height = 315;
    $id     = "";
    
    foreach ($argv as $param)
    {
        $param = trim($param);
        
        if (preg_match('/^s(mall)?$/i',$param))    // Small 560x315
        {
            $width  = 560;
            $height = 315;
        }
        elseif (preg_match('/^m(iddle)?$/i',$param))    // Middle 640x360
        {
            $width  = 640;
            $height = 360;
        }
        elseif (preg_match('/^l(arge)?$/i',$param))    // Large 854x480
        {
            $width  = 853;
            $height = 480;
        }
        elseif (preg_match('/^hd?$/i',$param))    // HD 1280x720
        {
            $width  = 1280;
            $height = 720;
        }
        elseif (preg_match('/^(w(idth)?=?)(\d+)$/i',$param,$match))    // Width
        {
            $width = $match[3];
        }
        elseif (preg_match('/^(h(eight)?=?)(\d+)$/i',$param,$match))    // Height
        {
            $height = $match[3];
        }
        elseif (preg_match('/^(\d+)[x*-:\/](\d+)$/i',$param,$match))    // WxH
        {
            $width  = $match[1];
            $height = $match[2];
        }
        elseif (preg_match('/^((id=)|(#?))([\w\d-]+)$/i',$param,$match))    // ID
        {
            $id = $match[4];
        }
    }
    if ($id == '')
    {
        $main_tag = '<div>Invalid youtube id = '.$id.'</div>';
    }
    else
    {
        $id     = htmlspecialchars($id);
        $width  = htmlspecialchars($width);
        $height = htmlspecialchars($height);
        $main_tag = '<iframe width="'.$width.'" height="'.$height.'" src="//www.youtube.com/embed/'.$id.'" frameborder="0" allowfullscreen></iframe>';
    }
    return $pre_tag.$main_tag.$post_tag;
}
 
?>