PHP - Problema con la nueva actualización de PHP

$contacto = new mysqli($hostname_contacto, $username_contacto, $password_contacto);

$contacto = new mysqli($hostname_formacion, $username_formacion, $password_formacion);

$contacto = new mysqli($hostname_formacion, $username_formacion, $password_formacion, $database_formacion);

$contacto = new mysqli($hostname_contacto, $username_contacto, $password_contacto);

$contacto = new mysqli($hostname_contacto, $username_contacto, $password_contacto, $database_contacto);

mysqli_select_db($database_contacto, $contacto);

$Recordset1 = $contacto->query($query_Recordset1, $contacto) or die(mysqli_error());

$Recordset1 = $contacto->query($query_Recordset1) or die(mysqli_error());

$Recordset3 = $contacto->query($query_Recordset3, $contacto) or die(mysqli_error());

$Recordset3 = $contacto->query($query_Recordset3) or die(mysqli_error());

<?php error_reporting(0);  ?>