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                # Coroutine::fwrite 協程方式向文件寫入數據。 ```php function Coroutine::fwrite(resource $handle, string $data, int $length = 0); ``` > 需要`2.0.11`或更高版本 參數 ---- * `$handle`文件句柄,必須是`fopen`打開的文件類型`stream`資源 * `$data`要寫入的數據內容,可以是文本或二進制數據 * `$length`寫入的長度,默認為`0`,表示寫入`$data`的全部內容,`$length`必須小于`$data`的長度 返回值 ---- 寫入成功返回數據長度,失敗返回`false` 版本差異 --- `4.0.4`以下版本`fwrite`方法不支持非文件類型的`stream`,如`STDOUT`、`Socket`,請勿使用`fwrite`操作此類資源。 `4.0.4`以上版本`fwrite`方法支持了非文件類型的`stream`資源,底層會自動根據`stream`類型選擇使用`AIO`線程池或`EventLoop`實現。 示例 --- ```php use Swoole\Coroutine as co; $fp = fopen(__DIR__ . "/test.data", "a+"); co::create(function () use ($fp) { $r = co::fwrite($fp, "hello world\n", 5); var_dump($r); }); ```
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