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：
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<?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 classcfile { //The path to the file we wish to work with. protected$thepath; //Error messages in the form of constants for ease of use. constFOUNDERROR ="Sorry, the file in question does not exist."; constPERMERROR ="Sorry, you do not have the proper permissions on this file"; constOPENERROR ="Sorry, the file in question could not be opened."; constCLOSEERROR ="Sorry, the file could not be closed."; //The constructor function. publicfunction__construct (){ $num_args= func_num_args(); if($num_args> 0){ $args= func_get_args(); $this->thepath =$args[0]; } } //A function to open the file. privatefunctionopenfile ($readorwrite){ //First, ensure the file exists. try{ if(file_exists($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{ thrownewexception (self::OPENERROR); returnfalse; } }catch(exception$e) { echo$e->getmessage(); } }else{ thrownewexception (self::PERMERROR); } }catch(exception$e) { echo$e->getmessage(); } }else{ thrownewexception (self::FOUNDERROR); } }catch(exception$e) { echo$e->getmessage(); } } //A function to close a file. functionclosefile () { try{ if(!fclose ($this->thepath)){ thrownewexception (self::CLOSEERROR); } }catch(exception$e) { echo$e->getmessage(); } } //A function to read a file, then return the results of the read in a string. publicfunctionread () { //First, attempt to open the file. $filepointer=$this->openfile ("r"); //Now, return a string with the read data. if($filepointer!= false){ //Then we can read the file. returnfgets($filepointer); } //Lastly, close the file. $this->closefile (); } //A function to write to a file. publicfunctionwrite ($towrite) { //First, attempt to open the file. $filepointer=$this->openfile ("w"); //Now, return a string with the read data. if($filepointer!= false){ //Then we can read the file. returnfwrite ($filepointer,$towrite); } //Lastly, close the file. $this->closefile (); } //A function to append to a file. publicfunctionappend ($toappend) { //First, attempt to open the file. $filepointer=$this->openfile ("a"); //Now, return a string with the read data. if($filepointer!= false){ //Then we can read the file. returnfwrite ($filepointer,$toappend); } //Lastly, close the file. $this->closefile (); } //A function to set the path to a new file. publicfunctionsetpath ($newpath) { $this->thepath =$newpath; } } ?> |
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<?php $myfile=newcfile ("test.txt"); //Now, let's try reading it. echo$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：
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<?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); ?> |