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Warning: Undefined variable $database_conexion in /home/a61823/public_html/cabecera.php on line 2

Fatal error: Uncaught TypeError: mysqli_select_db(): Argument #1 ($mysql) must be of type mysqli, null given in /home/a61823/public_html/cabecera.php:2 Stack trace: #0 /home/a61823/public_html/cabecera.php(2): mysqli_select_db() #1 {main} thrown in /home/a61823/public_html/cabecera.php on line 2