php pdo PDO::FETCH_LAZY Keeping track of db cursor/pointer - php

Question

What am I doing wrong? How do I track the db cursor if the primary key is not consecutive?
MySQL driver.
$sql = "SELECT * FROM employees";
$stmt = $db->query($sql);
$result = $stmt->fetch(PDO::FETCH_LAZY);
var_dump($result);
output:
object(PDORow)[3]
public 'queryString' => string 'SELECT * FROM employees' (length=23)
public 'employeeNumber' => string '1002' (length=4)
public 'lastName' => string 'Murphy' (length=6)
public 'firstName' => string 'Diane' (length=5)
public 'extension' => string 'x5800' (length=5)
public 'email' => string 'dmurphy#classicmodelcars.com' (length=28)
public 'officeCode' => string '1' (length=1)
public 'reportsTo' => null
public 'jobTitle' => string 'President' (length=9)
$result = $stmt->fetch(PDO::FETCH_ORI_FIRST);
var_dump($result);
output:
array (size=8)
'employeeNumber' => string '1056' (length=4)
'lastName' => string 'Patterson' (length=9)
'firstName' => string 'Mary' (length=4)
'extension' => string 'x4611' (length=5)
'email' => string 'mpatterso#classicmodelcars.com' (length=30)
'officeCode' => string '1' (length=1)
'reportsTo' => string '1002' (length=4)
'jobTitle' => string 'VP Sales' (length=8)
$result = $stmt->fetch(PDO::FETCH_ORI_NEXT);
var_dump($result);
output:
array (size=16)
'employeeNumber' => string '1076' (length=4)
0 => string '1076' (length=4)
'lastName' => string 'Firrelli' (length=8)
1 => string 'Firrelli' (length=8)
'firstName' => string 'Jeff' (length=4)
2 => string 'Jeff' (length=4)
'extension' => string 'x9273' (length=5)
3 => string 'x9273' (length=5)
'email' => string 'jfirrelli#classicmodelcars.com' (length=30)
4 => string 'jfirrelli#classicmodelcars.com' (length=30)
'officeCode' => string '1' (length=1)
5 => string '1' (length=1)
'reportsTo' => string '1002' (length=4)
6 => string '1002' (length=4)
'jobTitle' => string 'VP Marketing' (length=12)
7 => string 'VP Marketing' (length=12)
$result = $stmt->fetch(PDO::FETCH_ORI_LAST);
var_dump($result);
output:
array (size=8)
0 => string '1088' (length=4)
1 => string 'Patterson' (length=9)
2 => string 'William' (length=7)
3 => string 'x4871' (length=5)
4 => string 'wpatterson#classicmodelcars.com' (length=31)
5 => string '6' (length=1)
6 => string '1056' (length=4)
7 => string 'Sales Manager (APAC)' (length=20)