SWFUpload与CI不能正确上传识别文件MIME类型解决方法分享

//Edit By Tacker 
if(function_exists('mime_content_type')){ 
$this->file_type = preg_replace("/^(.+?);.*$/", "\\1", mime_content_type($this->file_temp)); 
}else{ 
$this->file_type = preg_replace("/^(.+?);.*$/", "\\1", $_FILES[$field]['type']); 
}