(PHP 4 >= 4.3.2, PHP 5, PHP 7)
streamWrapper::stream_write — Write to stream
$data
)This method is called in response to fwrite().
Note:
Remember to update the current position of the stream by number of bytes that were successfully written.
dataShould be stored into the underlying stream.
Note:
If there is not enough room in the underlying stream, store as much as possible.
Should return the number of bytes that were successfully stored, or 0 if none could be stored.
调用此方法失败将给出
E_WARNING（未实现）。
Note:
If the return value is greater the length of
data,E_WARNINGwill be emitted and the return value will truncated to its length.