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 UploadFront page:<pre><!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 a file to upload<BR><inputtype= "file"name= "myfile"></input><BR> <inputtype= "submit"value= "upload file"></input> </form></Div></Body></HTML></pre>　　Background processing:<pre><?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 ' && $filetype! = ' application/pdf ') {echo " File types can only be JPG and PDF "; Exit (); }*/ if(Is_uploaded_file($_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".$FILES[' myfile '] [' name ']. " Failed;}?></pre>　　second, the file download:Single File Download:<pre><?PHPfunctionDown_file ($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 }?></pre>　　Multiple file Downloads:Downlist.php:<pre><pre><a href= "downprocess.php?filename=1.jpg" >down</a> <a href= "downprocess.php?filename=2.jpg" >down</a> <a href= "downprocess.php?filename=3.jpg" >down</a> <a href=" downprocess.php?filename=4.jpg ">down</ A> </pre></pre>　　Downprocess.php:<pre><?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);?></pre>php file upload and download source code

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