php file upload and download source code

Last Update:2016-06-04 Source: Internet

Author: User

Tags fread php file upload ranges

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　　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= "50"></TextArea><Br> select a file to upload<Br><InputType= "File"Name= "MyFile"></Input><br> <input type= "Submit" = "Upload file" ></ input> </form></div< Span style= "color: #0000ff;" >></body>< Span style= "color: #0000ff;" ></html>

　　Background processing:

<?Php//Receive information about submitting a page transfer$name =$_post[' username '];$intro =$_post[' Fileintro '];//$_files the relevant information of the file//echo "<pre>";//Print_r ($_files);//echo "</pre>";//You can limit the file size 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/".$name;//Determine if the user already has a folderif (!File_exists ($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",  $moveto echo "Upload file". ;} elseecho" Upload file ". Span style= "color: #800080;" >$_files[' myfile ' [' Name ']. " Failed ";}} elseecho" Upload file ". Span style= "color: #800080;" > $FILES [' myfile '] [' name ']. " Failed ";}?

　　Second, the file download:

Single File Download:

<?Phpfunction Down_file ($file _name,$file _path){//$file _name = Iconv ("Uft-8", "gb2312", $file _name); If the file name is in Chinese, the Chinese name needs to be transcoded gb2312//The file to be downloaded reads into the server's memory//the server returns the file data to the browser//browser writes the file to the user-specified location//1. Determine if a file existsif (!File_exists ($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 fileHeader ("Content-type:application/octet-stream");//return by byte sizeHeader ("Accept-ranges:bytes");//Return file sizeHeader ("Accept-length:$file _size ");//Client Pop-up dialog box, corresponding file nameHeader ("Content-disposition:attachment;filename=".$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 documentwhile (!Feof$FP) && ($file _size-$file _count>0 $file _data = fread (  $fp,  $buffer ); // statistics read how many bytes  $file _count+  $buffer echo  $file _data//  $fp //}?>

　　Multiple file Downloads:

downlist.php:

<a href= "downprocess.php?filename=1.jpg" >down</a> <br><br><a href= "downprocess.php?filename=2.jpg" >down</a><br><br><a href= "downprocess.php?filename=3.jpg" >down</a><br><br><a href=" Downprocess.php?filename=4.jpg ">down</ A><br><br>

　　downprocess.php:

<?Php$filename =$_request[' filename '];function Down_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 sizeHeader ("Accept-ranges:bytes");//Return file sizeHeader ("Accept-length:$file _size ");//Client Pop-up dialog box, corresponding file nameHeader ("Content-disposition:attachment;filename=".$file _name);$buffer = 1024;//Defining buffers$file _count = 0;//Feof used to determine whether a file is read to the end of a documentwhile (!Feof$FP) && ($file _size-$file _count>0) { $file _data = fread ($fp,$buffer); // Statistics read the number of bytes $file _count+$buffer; echo $file _data; //Send some data to the browser } fclose ($fp);} down_file ($filename);? >

php file upload and download source code

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