simple function to connect with SQL server in PHP

mysql.php

<?php
function connect_db($host=false, $user=false, $pass=false, $database=false, $query='SELECT 1', $throw_error=true){
    //defaults
    if($host)$host='localhost';
    if($user)$user='root';
    if($pass)$pass=null;
    $connection_object=null;
    if($database){
        //connect to server, directly to database
        $connection_object=new mysqli($hosr,$user,$password,$database);
    }else{
        //connect to server
        $connection_object=new mysqli($hosr,$user,$password);
    }
    if($conn->connect_error){
        //error on connect with database
        if($throw_error){
            //if you want to hide error, give to 6'th argumnet false; DEFAULT - returning error string as below
            echo "<b>#ERROR#</b> - It looks like a problem with connection...<b>check connection settings</b>(user:'$user', server:'$host', password:'$pass', database:'$database'): ".$connection_object->connect_error;
            die();
        }else return false;       //if error hidden, returning false
    }else{
        //execute query, close connection and return data from query execution
        $query_result=$connection_object->query($query);
        $return_value=[];
        while($row_of_data=mysqli_fetch_assoc($query_result)){
            $return_value[]=$row_of_data; 
        }
        $connection_object->close();
        return $return_value;
    }
}
?>