几个封装很好的文件函数

/**
 * 循环创建目录
 */
function createFilePath($filepath){
   if(!$filepath){
      throw new Exception('filepath is null');
   }
   if(!file_exists($filepath)){
      $this->createFilePath(dirname($filepath));//创建文件路径
   }else{
      return true;
   }
   return mkdir($filepath,0777);
}

/**
 * 写入文件
 */
function wireteFile($str,$filename){
   
   $this->createFilePath(dirname($filename));
   $fp = fopen($filename,'w');
   $result = fwrite($fp,$str);
   fclose($fp);
   return $result ? true:false;
}

/**
 * 写入文件允许追加写入
 */
function writeFile($str,$is_add=false,$filename){
   $this->createFilePath(dirname($filename));
   $fp = $is_add ? fopen($filename,'a') : fopen($filename,'w');
   $result = fwrite($fp,$str);
   fclose($fp);
   return $result ? true:false;
}