Merge files from zip archive to a destination folder

merge-zip-files-to-folder-script.php

const ZIP_FILEPATH = '/path';
const ZIP_FILENAME = 'archive.zip';
const ZIP_SUBDIRNAME = 'subdir'; // Folder inside archive
const ZIP_MAINDIRNAME = "maindir"; // Target folder containing files

/* If small archive folder use PHP. Note, on some big archives it doesn't extract all subfolders and files */
function mergeFromZipPHP()
{
    $zip = new ZipArchive; // need to be isntalled on server
    $zipPath = self::ZIP_FILEPATH.'/'.self::ZIP_FILENAME;
    $zipExtractPath = self::ZIP_FILEPATH.'/';
    
    try {
        if (($error = $zip->open($zipPath)) !== TRUE) {
            throw new Exception($error);
        }
        $zip->extractTo($zipExtractPath);
        $zip->close();
        
        /* Bash cmd to merge files together in the dest directory : copy non present files / override / keep structure */
        shell_exec("cp -RT $zipExtractPath/".self::ZIP_SUBDIRNAME.'/'.self::ZIP_MAINDIRNAME."/ ".self::ZIP_FILEPATH."/");
        /* Remove current extracted directory and zip as you don't need them anymore */
        shell_exec("rm -rf $zipExtractPath/".self::ZIP_SUBDIRNAME);
        shell_exec("rm -f $zipPath");
    
    } catch(Exception $e) {
        return $e->getMessage() === ZipArchive::ER_NOENT ? false : $e->getMessage();
    }
    
    return true; // return what you want
}

/* Else use bash cmd to be faster */
function mergeFromZipBash()
{
    $zipPath = self::ZIP_FILEPATH.'/'.self::ZIP_FILENAME;
    $zipExtractPath = self::ZIP_FILEPATH.'/';
    
    shell_exec("unzip -o $zipPath -x -d $zipExtractPath");
    /* Bash cmd to merge files together in the dest directory : copy non present files / override / keep structure */
    shell_exec("cp -RT $zipExtractPath/".self::ZIP_SUBDIRNAME.'/'.self::ZIP_MAINDIRNAME."/ ".self::ZIP_FILEPATH."/");
    /* Remove current extracted directory and zip as you don't need them anymore */
    shell_exec("rm -rf $zipExtractPath/".self::ZIP_SUBDIRNAME);
    shell_exec("rm -f $zipPath");

    return true;  // return what you want
}