stream_set_blocking()

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

为资源流设置阻塞或者阻塞模式

说明

为$stream设置阻塞或者阻塞模。

此函数适用于支持非阻塞模式的任何资源流（常规文件，套接字资源流等）。

参数

资源流。

如果$mode为0，资源流将会被转换为非阻塞模式；如果是1，资源流将会被转换为阻塞模式。该参数的设置将会影响到像fgets()和fread()这样的函数从资源流里读取数据。在非阻塞模式下，调用fgets()总是会立即返回；而在阻塞模式下，将会一直等到从资源流里面获取到数据才能返回。

返回值

成功时返回TRUE，或者在失败时返回FALSE。

更新日志

注释

该函数之前叫作set_socket_blocking()后来又叫做socket_set_blocking()，但是这种用法都已经被废弃。

参见

• 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

On Windows this function does not work with pipes opened with proc_open (https://bugs.php.net/bug.php?id=47918, https://bugs.php.net/bug.php?id=34972, https://bugs.php.net/bug.php?id=51800)

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.

It is necessary to be noted that stream_set_blocking() and stream_set_timeout() does not work width standard I/O streams, such as STDIN and STDOUT.

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