Introduction to ZipArchive compressing files and downloading packaged files in PHP

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Introduction to ZipArchive compressing files and downloading packaged files in PHP_PHP Tutorial

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Jul 20, 2016 am 11:10 AM

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The article briefly introduces ZipArchive compressed files in PHP and downloads packaged files. Friends who need to know about file packaging in PHP can refer to the following five pages.

Analysis of technical points:

Package files into zip format
Function of downloading files
Key points analysis:

Here I use the ZipArchive class that comes with PHP
a) We only need to create a new ZipArchive object, then use the open method to create a zip file, and then use the addFile method to write the file to be packaged into the zip file just created. It is best to remember to close the object.

b) Note: When using the open method, the second parameter $flags is optional. $flags is used to specify the processing method of the opened zip file. There are four situations

through one

iii. ZIPARCHIVE::EXCL If the specified zip file exists, an error will be reported

iv. ZIPARCHIVE::CHECKCONS

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Process of downloading files:

Server-side work:

---------------------------------------------

Customer The browser on the end sends a request to handle the downloaded php file.
Note: Any operation needs to be written to the memory first. Whether it is a video, audio or text file, it needs to be written to the memory first.
In other words, the operation of reading the files on the "server" into the memory of the "server" is essential (note: here I put the word server in double quotes, mainly to illustrate this A series of operations are completed on the server).

Since you want to write the file into the memory, you must open the file first
So here are three file operation functions:
One: fopen($filename,$ mode)
Two: fread ( int $handle , int $length )
Three: fclose ( resource $handle )

---------------- -----------------------

Client side work:

---------------- -----------------------
So, how to pass the file information stream that already exists in the server-side memory to the client?
The answer is that through the header() function, the client knows how to process the file, whether to save or open, etc.

The final effect is as shown below:

The code is as follows

Copy code

require'./download.php';
/**
* Traverse the directory and package it into zip format
*/
class traverseDir{
public $currentdir;//Current directory
public $filename;//File name
public $fileinfo;//Used Save all file names, directory names and file sizes in the current directory
public function __construct(){
$this->currentdir=getcwd(); // Return to the current directory
} Traverse the directory
public function scandir($filepath){
if (is_dir($filepath)){
$arr=scandir($filepath);
foreach ($arr as $k=> $v){
$this-> 🎜> echo "<script> alert ('The current directory is not a valid directory'); > return filesize($fname)/1024; $zip=new ZipArchive(); $zipname=date('YmdHis', time()); :OVERWRITE);//Create an empty zip file for ($i=0;$i<count($items);$i++){ $zip->addFile($this-> currentdir.'/'.$items[$i],$items[$i]); . .zip'); //Download file $dw->getfiles(); unlink($zipname.'.zip'); //Delete after downloading is complete } } } ?></script>

The code is as follows

Copy code

/**
* Download file
*
*/
class download{
protected $_filename;
protected $_filepath;
protected $_filesize;//file size
public function __construct($filename){
$this- >_filename =$filename;
                                                                                                                                                                                                                   $ this->_filepath=dirname(__FILE__).'/'. return $ this->_filename; >                                                                                                                                                                                                                                                                              24) ,2); //Remove to two decimal places
}
this->_filepath)){
                                                                                                                                 Header(" Content-type: application/octet-stream");
                                                                                                                                                Header( "Accept-Length: ".filesize($this->_filepath));
                                                                                                                                                                                                                          // Here is the pop-up dialog box on the client, the corresponding file name .$this->_filename);
                                                                                                                                                 After the modification, only 1024 bytes of data are transmitted to the client
// Pack the data to the client
$ buffer = 1024; //
//Determine whether the file is finished reading
while (!feof($file)) {
                                                                                                                                                                                                 // Pack 1024 bytes of data to the client at a time
Echo $ File_data;
}

FClose ($ File);
} else {
echo "& lt; script & gt; alert('Sorry, the file you want to download does not exist');";
                                                                                                                                                                                             🎜>

页面中的显示代码如下

代码如下

复制代码

代码如下

复制代码

      header("Content-type:text/html;charset=utf8");
     require('./getfile.php');
     $scandir=new traverseDir();
     $scandir->scandir($scandir->currentdir);
     $scandir->currentdir;

     if (isset($_POST['down_load'])){
         $items=$_POST['items'];
         $scandir->tozip($items);//将文件压缩成zip格式
     }
     echo "当前的工作目录:".$scandir->currentdir;
     echo "
当前目录下的所有文件";
?>

Summary:

------------------------------------------ -----------------------------------------------

To download a file using PHP, you need to give four header(). You can refer to my other blog post: Super detailed process analysis of how PHP implements the download function
When calculating the size of a file, you do not need to open the file first. As you can see from filesize($filename), if you need to open the file first, filesize may be in the form filesize($filehandle)
To send data back to the client, remember to set a buffer, use To specify how much data to output to the client each time, such as: $buffer=1023. If not specified, the entire file will be written into the memory, and the data will be transmitted to the client all at once
Through the feof() function, you can determine whether the file to be read has been read. If it has not been read yet, After finishing, continue to read the file ($file_data=fread()), and send the data back to the client (echo $file_data)
After each download is completed, the client will refresh, which shows that, in fact, every time Write the data into a temporary file, and after all downloads are completed, reintegrate all the data together
Here I use absolute paths. The advantage of absolute paths is that they are more adaptable and relatively Compared with relative paths, it is more efficient (eliminating the process of finding files)

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