Yes I know that. It returns a number. Meanwhile I found out that 11 (what is
returned in my case) means that I have to try again, something like a
temporary unavailable resource. It is weird that the same program on the
command line returns a string to stdout without a problem. When I used it
from PHP then I get the errorno 11. Most likely it is a problem with the
program, not PHP or anything else, don't you agree? Unfortunately it is not
my program, I am obliged to use it, so I'm kind of stuck.

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