Notice: Undefined index: website_name in C:  xampp1  htdocs  muviko1  install  index.php on line 48

Notice: Undefined index: mysql_host in C:  xampp1  htdocs  muviko1  install  index.php on line 50

Fatal error: Uncaught Error: Call to undefined function mysql_connect () in C:  xampp1  htdocs  muviko1  install  index.php: 72 Stack trace: # 0 {main} thrown in C:  xampp1  htdocs  muviko1  install  index.php on line 72

if(isset($_POST['install'])) {
$config_path = '../core/config.php';
$website_name = $_POST['website_name'];
$website_domain = $_POST['website_domain'];
$mysql_db_host = $_POST['mysql_host'];
$mysql_db_user = $_POST['mysql_db_user'];
$mysql_db_pass= $_POST['mysql_db_pass'];
$mysql_db_name = $_POST['mysql_db_name'];
$filename = 'db.sql';
$config_contents = "<?php
$domain = '".$website_domain."';

// Database Configuration
$_db['host'] = '".$mysql_db_host."';
$_db['user'] = '".$mysql_db_user."';
$_db['pass'] = '".$mysql_db_pass."';
$_db['name'] = '".$mysql_db_name."';

$db = new mysqli($_db['host'], $_db['user'], $_db['pass'], $_db['name']) or die('MySQL Error');

error_reporting(0);
";
fopen($config_path, 'w+');
file_put_contents($config_path, $config_contents);

// Connect to MySQL server
mysql_connect($mysql_db_host, $mysql_db_user, $mysql_db_pass, $mysql_db_name) or die('Error connecting to MySQL server: ' . mysql_error());
// Select database