php file upload and download source code, _php tutorial

Source: Internet
Author: User
Tags fread php file upload ranges

php file upload and download source code,


  First, File upload

Front page:

  DOCTYPE HTML><HTML><Head>    <MetaCharSet= "Utf-8">    <title>File Upload
   title>
    Head><Body><Div>    <formMethod= "POST"Action= "upload.php"enctype= "Multipart/form-data" >User name<inputtype= "text"name= "username">
     input>        <BR>File Brief Introduction<BR><textareaname= "Fileintro"rows= "8"cols= " the"> 
        textarea > < BR > Select File to upload <br><input  type= "File"  name= "myfile"> 
         input><br  > <input  type= "Submit"  value= "Upload file" > 
          input >  
           form> 
            div> 
             body >  
              html>       

  Background processing:

 Php//receive information about submitting a page transfer$name=$_post[' username '];$intro=$_post[' Fileintro '];//information about files in $_files//echo "
";//Print_r ($_files);//echo"
";//You can limit the size of the file here/*$filesize = $_files[' myfile ' [' Size '];if ($filesize >2*1024*1024) {echo "file too large to upload"; Exit ();}*/ //file types can be restricted /*$filetype = $_files[' myfile ' [' type ']; if ($filetype! = ' image/jpg ' && $filetype! = ' application/pdf ') {echo "File type can only be jpg and PDF"; Exit (); }*/ if(Is_uploaded_file($_files[' MyFile '] [' Tmp_name '])) { //dump the files into the directory you want to store $uploaded=$_files[' MyFile '] [' Tmp_name ']; //Each user dynamically creates a folder $userpath=$_server[' Document_root ']. " /up/".$name; //determine if the user already has a folder if(!file_exists($userpath)){ mkdir($userpath); } //prevents the same user from uploading a file with the same name, adding a timestamp to the file. $moveto = $userpath. " /". Time (). $_files[' myfile ' [' name ']; or modify the file name, but you need to use string processing to intercept the filename suffix . $truename=$_files[' MyFile '] [' Name ']; $moveto=$userpath." /". Time().substr($truename,Strrpos($truename,".")); if(Move_uploaded_file($uploaded,Iconv("Utf-8", "gb2312",$moveto))){ Echo"Upload file".$_files[' MyFile '] [' name ']. " Success; }Else{ Echo"Upload file".$_files[' MyFile '] [' name ']. " Failed; }}Else{ Echo"Upload file".$FILES[' MyFile '] [' name ']. " Failed;}?>

  Second, the file download:

Single File Download:

 
 PhpfunctionDown_file ($file _name,$file _path){    //$file _name = Iconv ("Uft-8", "gb2312", $file _name); If the file name is in Chinese, the Chinese name needs to be transcoded gb2312//The file to be downloaded reads into the server's memory//the server returns the file data to the browser//browser writes the file to the user-specified location//1. Determine if a file exists    if(!file_exists($file _name)){        Echo"111"; return ; }    $fp=fopen($file _name, "R"); $file _size=filesize($file _name); //get file Size//can limit browser download file size via file_size. The returned file    Header("Content-type:application/octet-stream"); //return by byte size    Header("Accept-ranges:bytes"); //return file Size    Header("Accept-length:$file _size"); //Client Pop-up dialog box, corresponding file name    Header("Content-disposition:attachment;filename=".$file _name); $buffer= 1024; //define buffers//To download the security, it is best to use the file byte read counter    $file _count= 0; //feof used to determine whether a file is read to the end of a document     while(!feof($fp) && ($file _size-$file _count>0)){    $file _data=fread($fp,$buffer); //How many bytes did the statistic read ?    $file _count+$buffer; Echo $file _data; //send some data to the browser    }    fclose($fp); //Close File    }?>

  Multiple file Downloads:

downlist.php:

Down

Down

Down

Down

  downprocess.php:

 Php$filename=$_request[' filename ']; functionDown_file ($file _name){    if(!file_exists($file _name)){        Echo"111"; return ; }    $fp=fopen($file _name, "R"); $file _size=filesize($file _name); Header("Content-type:application/octet-stream"); //return by byte size    Header("Accept-ranges:bytes"); //return file Size    Header("Accept-length:$file _size"); //Client Pop-up dialog box, corresponding file name    Header("Content-disposition:attachment;filename=".$file _name); $buffer= 1024; //Defining Buffers    $file _count= 0; //feof used to determine whether a file is read to the end of a document     while(!feof($fp) && ($file _size-$file _count>0)){        $file _data=fread($fp,$buffer); //How many bytes did the statistic read ?        $file _count+$buffer; Echo $file _data; //send some data to the browser        }    fclose($fp); } down_file ($filename);?>

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