Rsync in PHP script

Hello,

I have an issue with a PHP script that execute a SH file.

My PHP script :

$output = shell_exec('sh api/fichier_bash.sh');
echo "$output";

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My SH file :

#!/bin/bash

/usr/bin/rsync -e ssh -avzru --delete-after /absolute_path/sound.wav root@IP:/absolute path

echo "Hello"

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If i go to my php web page, it print "Hello" but the file dosen't send in my remote server.
I didn't see in plesk the sudoers file to give permission for the apache user to execute a rsync command...

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