First experience with php yield, recursively traverse folders and compress them

php traverses a folder and compresses it into zip

Php code

  private function zip($path,$zipFile){
        $zip=new ZipArchive();
        $zip->open($zipFile,ZipArchive::CREATE);//创建一个空的zip文件
        $this->addFileToZip($path,$zip);
    }
    private function addFileToZip($path,ZipArchive $zip,$root=''){
        if(!is_dir($path)){
            return false;
        }
        if(!$root){
            $root= $path;
        }
        if(strpos($path,$root)!==0){
            $root= $path;
        }
        $handler=opendir($path); //打开当前文件夹由$path指定。
        while(($filename=readdir($handler))!==false){
            if($filename != "." && $filename != ".."){//文件夹文件名字为'.'和‘..’，不要对他们进行操作
                if(is_dir($path."/".$filename)){// 如果读取的某个对象是文件夹，则递归
                    $this->addFileToZip($path."/".$filename, $zip,$root);
                }else{ //将文件加入zip对象
                    $filenameWithPath = $path."/".$filename;
                    $localFileName = substr($filenameWithPath,strlen($root));
                    $zip->addFile($filenameWithPath,$localFileName);
                }
            }
        }
        @closedir($handler);
    }

Use yield to refactor the code

Php code

    private function zipFolder($folder,$zipFile){
        $zip=new ZipArchive();
        $zip->open($zipFile,ZipArchive::CREATE);//创建一个空的zip文件
        foreach($this->yieldFile($folder) as $file){
            $localFileName = substr($file,strlen($folder));
            $zip->addFile($file,$localFileName);
        }
    }
    private function yieldFile($path){
        if(is_dir($path)){
            $handler = opendir($path);
            while(($filename=readdir($handler))!==false){
                if($filename != "." && $filename != "..") {//文件夹文件名字为'.'和‘..’，不要对他们进行操作
                    if(is_dir($path."/".$filename)){// 如果读取的某个对象是文件夹，则递归
                        foreach($this->yieldFile($path."/".$filename) as $file){
                            yield $file;
                        }
                    }else{ //将文件加入zip对象
                        $file = $path."/".$filename;
                        yield $file;
                    }
                }
            }
            closedir($handler);
        }
    }

Code execution

Php code

  public function anyZip(){
        for($i=0;$i<6;$i++) {
            $start = microtime(true);
            $toPath = &#39;D:/unzip&#39;;
            $this->zipFolder($toPath, &#39;d:/zip/123.zip&#39;);
            $end = microtime(true);
            echo &#39;|zipFolder-delay:&#39; . ($end - $start);
            $start = microtime(true);
            $toPath = &#39;D:/unzip&#39;;
            $this->zip($toPath, &#39;d:/zip/124.zip&#39;);
            $end = microtime(true);
            echo &#39;|zip-delay:&#39; . ($end - $start) . &#39;<br>&#39;;
        }
    }

|zipFolder-delay:1. 6427090167999|zip- delay:1.6077039241791
|zipFolder-delay:1.6132049560547|zip-delay:1.6287071704865
|zipFolder-delay:1.6342070102692|zip-delay:1.6152048110962
|zipFolder-delay:1.6917150020599|zip-delay:1.6022040843964
|zipFolder-delay:1.6297070980072| zip-delay:1.7262189388275
|zipFolder-delay:1.5997030735016|zip-delay:1.5892019271851

The execution time difference between using yield recursion and normal recursion is not big. The main benefit is that data acquisition and data processing are separated, making it easier to understand and repeat. Use