PHP_文件操作及文件下载

// 文件操作的类

 

<?php // Copyright 2005, Lee Babin ([e-mail]) // 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);?>