php array not saved in object - php

Question

I do not understand fully why this PHP code is not saving the data in the arrays. when I echo out the array during the while loop, the values are set but after I exit the loop, the values in the array are missing. The other variables did contain their values after leaving the array.
<?php
class VIEWARRAY {
public $year;
public $month;
public $day = array();
public $views = array();
}
$viewdatabase = array();
$connection = MySQL_Connection($host, Session_Get("username"), Session_Get("password"), $database);
$dayviewindex = 0; $monthyearindex = 0; $previousmonth = "";
$information = MySQL_Script($connection, "SELECT * FROM viewdatabase");
while ($index = mysqli_fetch_array($information)) {
if ($index["month"] != $previousmonth) {
$viewdatabase[$monthyearindex] = new VIEWARRAY;
$viewdatabase[$monthyearindex]->year = $index["year"];
$viewdatabase[$monthyearindex]->month = $index["month"];
$dayviewindex = 0;
$monthyearindex++;
$previousmonth = $index["month"];
}
$viewdatabase[$monthyearindex]->day[$dayviewindex] = $index["day"];
$viewdatabase[$monthyearindex]->views[$dayviewindex] = $index["views"];
$dayviewindex++;
}
MySQL_Disconnect($connection);
//testing area
echo "->" . $viewdatabase[0]->year . " + " . $viewdatabase[0]->month . "<br />"; //prints out ->2013 + 8
echo "------>" . $viewdatabase[0]->day[2] . " + " . $viewdatabase[0]->views[2] . "<br />"; //prints out ------> +
echo count($viewdatabase[0]->views) . "<br />"; //prints out 0
echo count($viewdatabase[1]->views) . "<br />"; //prints out 0
?>
I made sure that I was able to connect to my database just fine and that my database did return information. This is how my database is setup
year month day views
2013 8 25 1
2013 8 26 1
2013 8 27 1
2013 9 3 1

Answer 1

At first run, after if ($index["month"] != $previousmonth), $monthyearindex will be 1.
That means you'll next try to access $viewdatabase[1] but it's NULL.
On the next iteration you won't enter the if, $monthyearindex will be 1, and $viewdatabase[1] will still be NULL.
So you never actually get to set anything in day and views.

Answer 2

Use
if ($index["month"] !== $previousmonth) {
instead of
if ($index["month"] != $previousmonth) {
, because
0 == ''
, but
0 !== ''
. Because,
$index['month'] != ''
is
false
, your if statement fails.