Notice: Undefined index: file in C:\home\robot\lotes_digital\index.php on line 6

Notice: Undefined index: quantity in C:\home\robot\lotes_digital\index.php on line 7

Notice: Undefined offset: 1 in C:\home\robot\lotes_digital\index.php on line 23

Fatal error: Uncaught PDOException: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1 in C:\home\robot\lotes_digital\index.php:24
Stack trace:
#0 C:\home\robot\lotes_digital\index.php(24): PDO->query('SELECT op.produ...')
#1 {main}
  thrown in C:\home\robot\lotes_digital\index.php on line 24