Warning: Undefined variable $conexao in /var/www/html/biografias.php on line 42

Fatal error: Uncaught TypeError: mysqli_prepare(): Argument #1 ($mysql) must be of type mysqli, null given in /var/www/html/biografias.php:42 Stack trace: #0 /var/www/html/biografias.php(42): mysqli_prepare() #1 {main} thrown in /var/www/html/biografias.php on line 42