Warning: Undefined variable $con in C:\inetpub\vhosts\bonifazi.it\httpdocs\agenzia_immobiliare.php on line 4

Fatal error: Uncaught TypeError: mysqli_real_escape_string(): Argument #1 ($mysql) must be of type mysqli, null given in C:\inetpub\vhosts\bonifazi.it\httpdocs\agenzia_immobiliare.php:4 Stack trace: #0 C:\inetpub\vhosts\bonifazi.it\httpdocs\agenzia_immobiliare.php(4): mysqli_real_escape_string() #1 {main} thrown in C:\inetpub\vhosts\bonifazi.it\httpdocs\agenzia_immobiliare.php on line 4