Display query result with PHP and MySQL - php

Question

I'm learning this new langage PHP in order to develop modules from this software : Dolibarr
It's the first time I'm using PHP and I don't overcome to display query result in my view.
I would like to know if I wrote something wrong in my script because I don't understand all up to now. I would like to display the number of users in my software. I have to query my llx_user table and display the result in my array.
This is the part of my code :
/*
* View
*/
//Display number of users
$sql = "SELECT COUNT(u.rowid) as total";
$sql.= " FROM ".MAIN_DB_PREFIX."user as u";
$result = $db->query($sql);
print '<table class="noborder" width="100%">';
print '<tr class="liste_titre"><th colspan="2">'.$langs->trans("Statistics").'</th></tr>';
if (! empty($conf->user->enabled))
{
$statUsers = '<tr class="oddeven">';
$statUsers.= '<td>'.$langs->trans("Number of Users").'</td><td align="right">'.round($result).'</td>';
$statUsers.= "</tr>";
}
$total=0;
if ($entity == '0')
{
print $statUsers;
$total=round($result);
}
print '<tr class="liste_total"><td>'.$langs->trans("Total").'</td><td align="right">';
print $total;
print '</td></tr>';
print '</table>';
print '</div></div></div>';
llxFooter();
$db->close();
As I said, it's the first time I'm handling php file and I began to learn php 3 hours ago.
This is what I got :
If I comment like this :
$total=0;
//if ($entity == '0')
//{
print $statUsers;
$total=round($result);
//}
I'm getting this :
But I have 2 users in my table :
Thank you if you could help me

Answer 1

You're doing a good job for that you just started with PHP. Anyway, there's a little mistake in your code.
You actually query the database, but you don't fetch the result.
You have to do the following after your query:
$row = $result->fetch_row();
print $row[0]; // $row[0] will contain the value you're looking for
Also it seems that your $entity is not equal to 0. I don't see you initializing this variable anywhere, are you sure you have defined it? May you want to show us some mor of your code..