I understand because of rightsThe most important thing to understand about programming
is that you never have to understand
And it is always necessary to know exactly
And especially don't start to rush and to make chaotic movements, the installation type sudo, prescribing ways and other things that are based on understanding
If something goes wrong, then the system always informs you about it
. And you just have to take this message and read. And then to correct the specific error
Is uncomfortable use normal exec shell_exec().
to see the error that is added to the end of the command
$out = shell_exec("sox media/60847/intro.wav -r 8000 -c 1 media/60847/intro.gsm 2>&1");
in out will the console output, including error.
Read the error and fix it