php - fwrite完成时php继续功能

Question

我需要加入两个 csv 文件，然后读取整个合并文件。
问题是 php 在fwrite工作时一直在执行函数。
所以当fwrite开始时需要暂停/停止。

static function dictionary($path) {
    $language_pack = Doo::conf()->SITE_PATH . Doo::conf()->PROTECTED_FOLDER . 'languages/' . $lang . '/language_pack.csv';
    Doo::joinFiles(array($lang_path, $common_lang_path), $language_pack);
// a pause must be done here until Doo::joinFiles finish it's job
    return Doo::translator('Csv', $language_pack, array('delimiter' => '|','enclosure' => '"'));
}

// this function joins array of files and will merge them into single file
static function joinFiles(array $files, $result) {
    if(!is_array($files)) {
        throw new Exception('`$files` must be an array');
    }

    $wH = fopen($result, "w+");

    foreach($files as $key => $file) {
        $fh = fopen($file, "r");
        while(!feof($fh)) {
            fwrite($wH, fgets($fh));
        }
        fclose($fh);
        unset($fh);
        fwrite($wH, "\n"); //usually last line doesn't have a newline
    }
    fclose($wH);
    unset($wH);
}

当我运行时Doo::dictionary()，language_pack.csv 文件仅包含第一个 csv 文件内容。