stream_select
Please notice that this function will not work as for PHP 5.2.0 at least on Win32 systems. It probably won't work on Linux boxes either.
PHP just ignores the function and blocking remains active.
For more information take a look at Bug #36918.
stream_set_blocking
(PHP 4 >= 4.3.0, PHP 5)
stream_set_blocking — Set blocking/non-blocking mode on a stream
Description
bool stream_set_blocking
( resource $stream
, int $mode
)
Sets blocking or non-blocking mode on a stream .
This function works for any stream that supports non-blocking mode (currently, regular files and socket streams).
Parameters
- stream
-
The stream.
- mode
-
If mode is 0, the given stream will be switched to non-blocking mode, and if 1, it will be switched to blocking mode. This affects calls like fgets() and fread() that read from the stream. In non-blocking mode an fgets() call will always return right away while in blocking mode it will wait for data to become available on the stream.
Return Values
Returns TRUE on success or FALSE on failure.
Changelog
| Version | Description |
|---|---|
| 4.3.0 | Prior to PHP 4.3.0, this function only worked on socket based streams. |
Notes
Note: This function was previously called as set_socket_blocking() and later socket_set_blocking() but this usage is deprecated.
See Also
- stream_select() - Runs the equivalent of the select() system call on the given arrays of streams with a timeout specified by tv_sec and tv_usec
add a note
User Contributed Notesstream_set_blocking
galvao at galvao dot eti dot br
15-Dec-2006 04:58
15-Dec-2006 04:58
MagicalTux at ookoo dot org
08-Sep-2006 06:13
08-Sep-2006 06:13
When you use fwrite() on a non-blocking stream, data isn't discarded silently as t dot starling said.
Remember that fwrite() returns an int, and this int represents the amount of data really written to the stream. So, if you see that fwrite() returns less than the amount of written data, it means you'll have to call fwrite() again in the future to write the remaining amount of data.
You can use stream_select() to wait for the stream to be available for writing, then continue writing data to the stream.
Non-blocking streams are useful as you can have more than one non-blocking stream, and wait for them to be available for writing.
t dot starling at physics dot unimelb dot edu dot au
08-Sep-2005 11:02
08-Sep-2005 11:02
Warning: if you write too much data to a stream in non-blocking mode and fill the buffer, the excess will be silently discarded. Observed in PHP 4.4.0 under linux.