How to zip folder in PHP?

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<?php

// create new zip archive
$zip = new ZipArchive();

// specify the path to the zip file and create it
$zipFile = 'path/to/zipfile.zip';
$zip->open($zipFile, ZipArchive::CREATE);

// specify the path to the folder that you want to zip
$folderToZip = 'path/to/folder';

// add the folder to the zip archive
$zip->addEmptyDir($folderToZip);

// create a recursive iterator for the folder
$files = new RecursiveIteratorIterator(
    new RecursiveDirectoryIterator($folderToZip),
    RecursiveIteratorIterator::LEAVES_ONLY
);

foreach ($files as $name => $file)
{
    // skip directories (they would be added automatically)
    if (!$file->isDir())
    {
        // get real and relative path for current file
        $filePath = $file->getRealPath();
        $relativePath = substr($filePath, strlen($folderToZip) + 1);

        // add current file to the zip archive
        $zip->addFile($filePath, $relativePath);
    }
}

// close the zip archive
$zip->close();

?>