Proper shell execution in PHP

Question

The problem

I was using a function that made use of proc_open() to invoke shell commands. It seems the way I was doing STDIO was wrong and sometimes cause

Answer 1

You've missed this note in the PHP manual for stream_select():

When stream_select() returns, the arrays read, write and except are modified to indicate which stream resource(s) actually changed status.

You need to re-create the arrays before calling stream_select() each time.

Depending on the process you're opening, this may be why your example still blocks.