Notice: Undefined variable: pdo in /var/www/html/chemicoweb/catalogo.php on line 9

Fatal error: Uncaught Error: Call to a member function prepare() on null in /var/www/html/chemicoweb/catalogo.php:9 Stack trace: #0 {main} thrown in /var/www/html/chemicoweb/catalogo.php on line 9