# swoole_async_writefile
异步写文件，调用此函数后会立即返回。当写入完成时会自动回调指定的callback函数。
~~~
swoole_async_writefile('test.log', $file_content, function($filename) {
echo "wirte ok.\n";
});
~~~
> swoole_async_writefile最大可写入4M的文件
swoole_async_writefile可以不指定回调函数
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