Handle error for duplicate entries - PHP MySQL

Question

I have a PHP form which enters data into my MySQL database. My primary key is one of the user-entered values. When the user enters a value that already exists in the table,

Answer 1

try this code to handle duplicate entries and show echo message:

  $query = "INSERT INTO ".$table_name." ".$insertdata;
                if(mysqli_query($conn,$query)){
                    echo "data inserted into DB
";                   
                }else{
                   if(mysqli_errno($conn) == 1062)
                       echo "duplicate entry no need to insert into DB
";
                   else
                    echo "db insertion error:".$query."
";

                }//else end