Stream 函数
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stream_set_blocking

(PHP 4 >= 4.3.0, PHP 5)

stream_set_blocking — Set blocking/non-blocking mode on a stream

说明

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).

参数

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.

返回值

成功时返回 TRUE， 或者在失败时返回 FALSE.

更新日志

版本 说明
4.3.0 Prior to PHP 4.3.0, this function only worked on socket based streams.

注释

Note:

This function was previously called as set_socket_blocking() and later socket_set_blocking() but this usage is deprecated.

参见

Stream 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Set blocking/non-blocking mode on a stream

用户评论:

MagicalTux at ookoo dot org (08-Sep-2006 07:13)

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 12:02)

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.