(PECL gearman >= 0.5.0)
GearmanTask::recvData — Read work or result data into a buffer for a task
$data_len
) : array
�˺�����ʵ�����ġ��˺����ı��������Ƽ�������ĵ���������δ���� PHP �����汾��δ֪ͨ�ͱ��ġ�ʹ�ñ����������Ե� ��
data_lenLength of data to be read.
An array whose first element is the length of data read and the second is the data buffer.
Returns FALSE if the read failed.