mysqli array does not print values properly - php

Question

I'm having trouble printing out the values from my MySQLi query. Here is the db connection class that I am using.
class db
{
public function __construct()
{
$this->mysqli = new mysqli('localhost', 'root','', 'database');
if (mysqli_connect_errno())
{
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
}
public function Query($SQL)
{
$this->SQL = $this->mysqli->real_escape_string($SQL);
$this->Result = $this->mysqli->query($SQL);
if ($this->Result == true)
return true;
else
die('Problem with Query: ' . $this->SQL);
}
public function Get($field = NULL)
{
if ($field == NULL)
{
$data = array();
while ($row = $this->Result->fetch_assoc())
{
$data[] = $row;
}
}
else
{
$row = $this->Result->fetch_assoc();
$data = $row[$field];
}
$this->Result->close();
return $data;
}
public function __destruct()
{
$this->mysqli->close();
}
}
Running a query
$db = new db;
$db->Query("SELECT * FROM tblclients WHERE clientid = $this->id");
$result = $db->Get();
echo $result['clientid'];
I'm getting error
PHP Notice: Undefined index: clientid
However I know the values are getting passed to the $results array when I run
print_r ($result);
I get this returned
Array ( [0] => Array ( [clientid] => 2 [firstname] => John [lastname] => Doe [dob] => 1962-05-08))
For what its worth, if I try echo $db->Get('firstname'); everything works. Been banging my head against the wall for a while now, any help appreciated.

Answer 1

As you can see you have an array inside another array. To get what you need you need to go like this:
$result[0]['clientid'];
So what we're doing here is you are first calling the $result variable which contains an array with an index of [0], then this array contains the column names from your query (ex: ['clientid']).
So you basically have to go deeper than $result['clientid'] to get your data from the database by firstly calling the array that contains those keys from the database.
To un-nest that array, do something like:
$result = $db->Get();
$normal_result = 0;
foreach ($result as $value)
{
$normal_result = $value;
}
You can use this inside your method, so you'll get normal results only in the future.