PHP implements zip compressed file decompression code sharing (simple and easy to understand)_PHP tutorial

After careful study, it turns out that the decompression program written in PHP is much more efficient than expected. Since it is so good, I might as well optimize it and use it in my own backend. Although most space control panels now have Compression and decompression are functions, but after all, they are sometimes troublesome.

Before doing this, I had never been exposed to PHP compression. I searched some online and found that most of them were PHP compression classes and compression functions, ranging from a few hundred lines to thousands of lines of code. This is very confusing for a novice like me, and I don’t need such complicated functions. Finally, refer to the function manual, and after clarifying several related functions, you will understand how to adjust them.

Remember to enable zip and remove the semicolon in front of extension=php_zip.dll in php.ini.

Source code example:

Copy code The code is as follows:

//Need to enable configuration php_zip.dll
//phpinfo();
header("Content-type:text/html;charset=utf-8");

function get_zip_originalsize($filename, $path) {
//First determine whether the file to be decompressed exists
if(!file_exists($filename)){
die("File $filename does not exist ! ");
}
$starttime = explode(' ',microtime()); //The time when decompression starts

//Convert the file name and path to the default gb2312 encoding of the windows system , otherwise it will not be read
$filename = iconv("utf-8","gb2312",$filename);
$path = iconv("utf-8","gb2312",$path );
//Open the compressed package
$resource = zip_open($filename);
$i = 1;
//Traverse and read each file in the compressed package
while ( $dir_resource = zip_read($resource)) {
//If it can be opened, continue
if (zip_entry_open($resource,$dir_resource)) {
//Get the name of the current project, which is inside the compressed package The current corresponding file name
$file_name = $path.zip_entry_name($dir_resource);
//Split with the last "/", and then use the string to intercept the path part
$file_path = substr($ file_name,0,strrpos($file_name, "/"));
//If the path does not exist, create a directory, true means that multi-level directories can be created
if(!is_dir($file_path)){
mkdir($file_path,0777,true);
}
//If it is not a directory, write the file
if(!is_dir($file_name)){
//Read This file
$file_size = zip_entry_filesize($dir_resource);
//Maximum reading is 6M. If the file is too large, skip decompression and continue to the next one
if($file_size<(1024*1024*6 )){
$file_content = zip_entry_read($dir_resource,$file_size);
file_put_contents($file_name,$file_content);
}else{
echo "

".$i++. " This file has been skipped, reason: the file is too large, -> ".iconv("gb2312","utf-8",$file_name)."

";
}
}
//Close the current
zip_entry_close($dir_resource);
}
}
//Close the compressed package
zip_close($resource);
$endtime = explode( ' ',microtime()); //The time when decompression ends
$thistime = $endtime[0]+$endtime[1]-($starttime[0]+$starttime[1]);
$ thistime = round($thistime,3); //Keep 3 as a decimal
echo "

Decompression completed! , this decompression cost: $thistime seconds.

";
}

$size = get_zip_originalsize('20131101.zip','temp/');

?>

The test decompressed a small file of more than 300 KB, which took 0.115 seconds. The test decompressed a 30 MB file (web page files, more small files), which took more than 20 seconds.

http://www.bkjia.com/PHPjc/768138.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/768138.htmlTechArticleAfter careful study, it turns out that the decompression program written in PHP is much more efficient than expected. In this case Okay, let’s just optimize it and use it in our own backend. Although most of them are now...