Help me to fix the code abd debug it

connect$\_$error$)\{$

die$("$Connection failed: $".$ $conn$->$connect$\_$error$)$;

$\}$

$//$ Insert the complaint into the Complaints table

$sql $=$ "INSERT INTO Complaints $($UserID$,$ ComplaintText$)$

VALUES $(\text{'}$user$\_$id$\_$placeholder', $\text{'}$$complaint'$)"$; $//$ Replace 'user$\_$id$\_$placeholder' with the actual user ID

if $($$conn$->$query$($$sql$)===$ TRUE$)\{$

echo "Complaint submitted successfully";

$\}$ else $\{$

echo "Error submitting complaint: $".$ $conn$->$error;

$\}$

$conn$->$close$()$;

$\}$

$?>$