Fatal error: Uncaught TypeError: mysqli_real_escape_string(): Argument #1 ($mysql) must be of type mysqli, PDO given in C:\inetpub\wwwroot\materia.php:22 Stack trace: #0 C:\inetpub\wwwroot\materia.php(22): mysqli_real_escape_string() #1 {main} thrown in C:\inetpub\wwwroot\materia.php on line 22