// 上传配置
    'upload' => array(
        'format' => 'jpg,jpeg,png,gif,xls,xlsx,doc,docx,ppt,pptx,rar,zip,pdf,txt,mp4,avi,flv,rmvb,mp3,otf,ttf',
        'max_width' => '1920',
        'max_height' => ''
    ),
    
    // 缩略图配置
    'ico' => array(
        'max_width' => '1000',
        'max_height' => '1000'
    ),