The PHP executes the shell_exec command but doesn't do anything - php

Question

I'm using this script to post some date using curl in a post.sh file
#!/bin/sh
var1=`base64 javascript_100.file`
# post it 3 times
for i in `seq 1 3`; do
/usr/bin/curl -i --verbose -d "jobTexterea=$var1" http://my_server_address/target_page.php
done
I don't have any problems executing the post.sh file using my Shell however when i invoke it inside my php script using shell_exec('sh /path_to_post_file/post.sh') I'm getting this error from my var_dump(shell_exec('sh /path_to_post_file/post.sh'));.
Error: () HTTP/1.1 302 Found Date: Sat, 24 Sep 2016 15:14:38 GMT Server: Apache/2.4.23 (Fedora) OpenSSL/1.0.2h-fips PHP/5.6.25 mod_perl/2.0.9 Perl/v5.22.2 X-Powered-By: PHP/5.6.25 Location: http://my_server_ ddress/ Content-Length: 401 Content-Type: text/html; charset=UTF-8 A MySQL error has occurred.
Your Query: INSERT INTO jobsNum_pro_batch (job_batch_id , jobs_in_batch , job_type ) VALUES ( '26' ,'1' ,'JavaScript' )
The code in the post.sh file posts the information to the target_page.php wich puts all the content into different tables in a database. The thing is that no information is being uploaded into the database with running shell_exec('sh /path_to_post_file/post.sh') from a PHP page. However, the command itself runs without errors, I checked it with
<?php
if (shell_exec('sh /path_to_post_file/post.sh')){
echo "<b> shell_exec was executed </b><br>";
var_dump(shell_exec('sh /path_to_post_file/post.sh'));
} else {
echo "<b> shell_exec was not executed </b><br>";
}
?>
I'm getting the message shell_exec was executed
Has anyone an idea what went wrong?

Answer 1

This did the trick! Thanks to #Jean-FrançoisFabre and a small change to his code and problem is gone!
#!/bin/sh
progdir=$(dirname $0)
var1=`base64 $progdir/javascript_100.file`
# post it 3 times
for i in `seq 1 3`; do
/usr/bin/curl -i --verbose -d "jobTexterea=$var1" http://my_server_address/target_page.php
done