PHP实现的文件操作类及文件下载功能示例

php  /  管理员 发布于 7年前   178

本文实例讲述了PHP实现的文件操作类及文件下载功能。分享给大家供大家参考，具体如下：

文件操作类：

 0){    $args = func_get_args();    $this->thepath = $args[0];   }  }  //A function to open the file.  private function openfile ($readorwrite){    //First, ensure the file exists.    try {      if (file_exists ($this->thepath)){        //Now, we need to see if we are reading or writing or both.        $proceed = false;        if ($readorwrite == "r"){          if (is_readable($this->thepath)){$proceed = true;          }        } elseif ($readorwrite == "w"){          if (is_writable($this->thepath)){$proceed = true;          }        } else {          if (is_readable($this->thepath) && is_writable($this->thepath)){$proceed = true;          }        }        try {          if ($proceed){//We can now attempt to open the file.try {  if ($filepointer = fopen ($this->thepath, $readorwrite)){    return $filepointer;  } else {    throw new exception (self::OPENERROR);    return false;  }} catch (exception $e) {  echo $e->getmessage();}          } else {throw new exception (self::PERMERROR);          }        } catch (exception $e) {          echo $e->getmessage();        }      } else {        throw new exception (self::FOUNDERROR);      }    } catch (exception $e) {      echo $e->getmessage();    }  }  //A function to close a file.  function closefile () {    try {      if (!fclose ($this->thepath)){        throw new exception (self::CLOSEERROR);      }    } catch (exception $e) {      echo $e->getmessage();    }  }  //A function to read a file, then return the results of the read in a string.  public function read () {    //First, attempt to open the file.    $filepointer = $this->openfile ("r");    //Now, return a string with the read data.    if ($filepointer != false){      //Then we can read the file.      return fgets ($filepointer);    }    //Lastly, close the file.    $this->closefile ();  }  //A function to write to a file.  public function write ($towrite) {    //First, attempt to open the file.    $filepointer = $this->openfile ("w");    //Now, return a string with the read data.    if ($filepointer != false){      //Then we can read the file.      return fwrite ($filepointer, $towrite);    }    //Lastly, close the file.    $this->closefile ();  }  //A function to append to a file.  public function append ($toappend) {    //First, attempt to open the file.    $filepointer = $this->openfile ("a");    //Now, return a string with the read data.    if ($filepointer != false){      //Then we can read the file.      return fwrite ($filepointer, $toappend);    }    //Lastly, close the file.    $this->closefile ();  }  //A function to set the path to a new file.  public function setpath ($newpath) {    $this->thepath = $newpath;  } }?>

read();  //Then let's try writing to the file.  $myfile->write ("Hello World!");  //Then, let's try appending.  $myfile->append ("Hello Again!");?>

文件下载：

更多关于PHP相关内容感兴趣的读者可查看本站专题：《php文件操作总结》、《PHP数组(Array)操作技巧大全》、《PHP基本语法入门教程》、《PHP运算与运算符用法总结》、《php面向对象程序设计入门教程》、《PHP网络编程技巧总结》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。

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