SQLSTATE[08006] [7] connection to server at "db" (172.25.0.2), port 5432 failed: FATAL:  password authentication failed for user "prj1_user" 
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<b>Warning</b>:  Undefined variable $conn in <b>/var/www/html/insert_data.php</b> on line <b>7</b><br />
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<b>Fatal error</b>:  Uncaught Error: Call to a member function exec() on null in /var/www/html/insert_data.php:7
Stack trace:
#0 {main}
  thrown in <b>/var/www/html/insert_data.php</b> on line <b>7</b><br />