PHP to implement file operation class and file download function tutorial

This article describes the PHP implementation of the file operation class and file download function. Share to everyone for your reference, specific as follows:

File Action class:

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<?php Copyright, Lee Babin (lee@thecodeshoppe.com) This code may is 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. Constfounderror = "Sorry, the file in question does not exist."; Constpermerror = "Sorry, you don't have the proper permissions on this file"; Constopenerror = "Sorry, the file in question could is not opened."; Constcloseerror = "Sorry, the file could not to 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) { Ensure the file exists. try{ if (file_exists ($this->thepath)) { Now, we need to the 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::P ermerror); } }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 () { The 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) { The 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) { The 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!"); ?>

File Download:

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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); ?>