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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:


<?php

 // Copyright 2005, Lee Babin (lee@thecodeshoppe.com)

 // This code may be used and redistributed without charge

 // under the terms of the GNU General Public

 // License version 2.0 or later -- www.gnu.org

 // Subject to the retention of this copyright

 // and GPL Notice in all copies or derived works

 class cfile {

  //The path to the file we wish to work with.

  protected $thepath;

  //Error messages in the form of constants for ease of use.

  const FOUNDERROR = "Sorry, the file in question does not exist.";

  const PERMERROR = "Sorry, you do not have the proper permissions on this file";

  const OPENERROR = "Sorry, the file in question could not be opened.";

  const CLOSEERROR = "Sorry, the file could not be closed.";

  //The constructor function.

  public function __construct (){

   $num_args = func_num_args();

   if($num_args > 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;

  }

 }

?>




<?php

  $myfile = new cfile ("test.txt");

  //Now, let's try reading it.

  echo $myfile->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:


<?php

$filename = 'file1.txt';

$file = fopen($filename, 'r');

Header("Expires: 0");

Header("Pragma: public");

Header("Cache-Control: must-revalidate, post-check=0, pre-check=0");

Header("Cache-Control: public");

Header("Content-Length: ". filesize($filename));

Header("Content-Type: application/octet-stream");

Header("Content-Disposition: attachment; filename=".$filename);

readfile($filename);

?>



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希望本文所述对大家PHP程序设计有所帮助。

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