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                # swoole_async_read 異步讀文件,使用此函數讀取文件是非阻塞的,當讀操作完成時會自動回調指定的函數。 ```php bool swoole_async_read(string $filename, mixed $callback, int $size = 8192, int $offset = 0); ``` 此函數與`swoole_async_readfile`不同,它是分段讀取,可以用于讀取超大文件。每次只讀`$size`個字節,不會占用太多內存。 在讀完后會自動回調`$callback`函數,回調函數接受2個參數: ```php bool callback(string $filename, string $content); ``` * $filename,文件名稱 * $content,讀取到的分段內容,如果內容為空,表明文件已讀完 > $offset參數在1.7.13以上版本可用 $callback函數,可以通過return true/false,來控制是否繼續讀下一段內容。 * return true,繼續讀取 * return false,停止讀取并關閉文件
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