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                ## Coroutine::writeFile 協程方式寫入文件。 ~~~ function Coroutine::writeFile(string $filename, string $fileContent, int $flags); ~~~ <br> ## 參數 * `$filename`為文件的名稱,必須有可寫權限,文件不存在會自動創建。打開文件失敗會立即返回false * `$fileContent`為要寫入到文件的內容,最大可寫入4M * `$flags`為寫入的選項,默認會清空當前文件內容,可以使用`FILE_APPEND`表示追加到文件末尾 <br> ## 返回值 寫入成功返回`true`,寫入失敗返回`false` <br> ## 示例 ~~~ use Swoole\Coroutine as co; $filename = __DIR__ . "/defer_client.php"; co::create(function () use ($filename) { $r = co::writeFile($filename,"hello swoole!"); var_dump($r); }); ~~~
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