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                # swoole\_async\_write 異步寫文件,與`swoole_async_writefile`不同,`swoole_async_write`是分段寫的。不需要一次性將要寫的內容放到內存里,所以只占用少量內存。`swoole_async_write`通過傳入的offset參數來確定寫入的位置。 ~~~ bool swoole_async_write(string $filename, string $content, int $offset = -1, mixed $callback = NULL); ~~~ * 當offset為-1時表示追加寫入到文件的末尾 * Linux原生異步IO不支持追加模式,并且`$content`的長度和`$offset`必須為512的整數倍。如果傳入錯誤的字符串長度或者`$offset`寫入會失敗,并且錯誤碼為`EINVAL` * callback函數返回false才會close文件, 否則fd將會在下一次write時被復用
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