Aren't the config files user-specific?
Make the configuration for www-data the same as those for user pi. Maybe. (Still guessing...)

^ you're all missing the point, which is this:
isn't working. called from a web page afaiu.
also AFAIU, the script itself is working, but not when it's called like this.
my repeated calls to go and check server/php logs died away unheard.
I could log into mine and check where they are located, then gently take OP by the hand and tell them wehere to look, but I really think they should put in the effort themselves.

Another question that comes to mind: did PHP ever work on that server?

1 members found this post helpful.

Unfortunately Apache logs does not show anything useful, this is also driving me crazy .
I see only it records the call from browser:

[03/Jun/2019:19:46:54 +0300] "GET /netatmo/sound.php HTTP/1.1" 200 205 "-" "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Firefox/60.0"

This is the first time I try to make the sound to work on this little Raspberry Pi server.
The webserver itself is functional, other pages, which does not involve sounds, works.

Now I tried another approach:
1. started mplayer in slave mode attached to a FIFO:
mplayer -slave -idle -input file=$FIFO_CONTAINER

2. Adding php script just the command to add a mp3 file to this FIFO:
<?php
$command = "echo loadfile /var/www/html/sound.mp3 > /tmp/fifo1";
exec($command);
?>

3. if I execute this php from command line in terminal:

sudo -u www-data php sound.php ===> this WORKS fine, sound is generated

4. but if I launch PHP from webpage there is no sound, and not sure where it might be the trick.

FIFO file has all needed permissions.

I repeat:
Is your web server configured to interpret PHP files at all?
Make some tests with less error-prone PHP (can be as simple as "echo bla").

Webserver works fine for other pages, as mentioned.
Finally it seems to be some kind of permission issues, included the *.sh script in www directory and from there works.
Thanks to all for involvement.

how are you ?

have you find a solution for this issue, i am facing same problem right now

i have also tried to trigger and exc the audio from nod-red ,but no voice to hear