swoole_async_read Read file stream asynchronously &reftitle.description; boolswoole_async_read stringfilename callablecallback intchunk_size65536 intoffset0 &reftitle.parameters; filename The filename of the file being read. callback mixedcallback stringfilename stringcontent filename The name of the file. content The content readed from the file stream. chunk_size The chunk length. offset The offset. &reftitle.returnvalues; Whether the read is succeed.