php中的pclose和fclose有什么区别

Question

I have some code that works with pipes and files. At the end of operation my function should close resource.

Can I close a pipe resource with fclose? It seems not hard for php to track how to close a resource but I see 2 functions.

I create pipe with popen function.

Otherwise I need a method to distinguish pipe and file resources.

get_resource_type returns "stream" for both resources.

Or I have to implement expensive wrapper classes.

class PipeStream {
    public function __desctruct() { pclose($this->resource); }
}
class FileStream {
    public function __desctruct() { fclose($this->resource); }
}

Answer 1

Read the documentation of pclose() . It is used to close a process resource created by popen() rather then a named pipe.

If you are working with so called, named pipes, which are objects stored in the file system, use:

• posix_mkfifo() to create them
• fopen() to open them
• fclose() to close them

As you see, to create a fifo it requires the posix extension meaning that it will not work on Windows as Windows itself does not support named pipes (or the posix standard in general)