Warning: mysqli_select_db() expects parameter 1 to be mysqli code example

Example 1: Warning: mysqli_error() expects exactly 1 parameter, 0

Change

die (mysqli_error()); 
to

die('Error: ' . mysqli_error($myConnection));
in the query

$query = mysqli_query($myConnection, $sqlCommand) or die (mysqli_error());

Example 2: mysqli_select_db expects 2 parameters

//do the correction as below:

$conn = mysqli_connect('localhost', 'root', '');
//the first thing that you have to pass connection variable in the select_db as first parameter. as below.

mysqli_select_db($conn,'altislife-dev');
//also you have to pass connection variable in mysqli_query() as first parameter as given below.

$records=mysqli_query($conn,$sql);