Unable to repeat/cycle through code with PHP and MySQL - php

Question

<?php
$query = "SELECT name FROM prodGroups";
$result = mysql_query($query);
$prodGroups = array();
while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
$prodGroups[] = $row['name'];
}
if (count($prodGroups) == 0 && (!isset($products))) // IF NO PRODUCT GROUPS EXIST
for ($j=1 ; $j<4 ; $j++)
{
echo "<li><a href='#'><span>Empty product group " . $j . "</span></a></li>";
}
else // FOR WHEN PRODUCT GROUPS DO EXIST
foreach ($prodGroups as $aGroup) // CYCLE THROUGH PRODUCT GROUPS
{
echo "<li class='submenu'><a href='#'><span>" . $aGroup . "</span></a>";
}
for ($k=0 ; $k<3 ; ++$k)
{
$query = "SELECT name FROM products WHERE prodGroup='$prodGroups[$k]'";
$result = mysql_query($query);
for ($j=0 ; $j<count($prodGroups) ; ++$j)
{
while ($row2 = mysql_fetch_array($result, MYSQL_ASSOC)) // PLACE PRODUCTS INTO AN ARRAY
{
$products[] = $row2['name'];
}
if (!isset($products)) // IF THERE ARE NO PRODUCTS INSIDE A PRODUCT GROUP
echo "<ul><li><a href='#'><span>No products</span></a></li></ul></li>";
else // FOR WHEN PRODUCT(S) DO EXIST INSIDE A PRODUCT GROUP
echo "<ul>";
if(isset($products))
foreach ($products as $item) // CYCLE THROUGH PRODUCTS
{
echo "<li><a href='#'><span>" . $item . "</span></a>";
}
echo "</ul>";
}
}
?>
For some reason, I can only get products to display on the last iterate of the loop, and not all of them. A variable is obviously being over written but I cannot identify which one nor can I over come it?
EDIT
Now I've incorporated appropriate indentation and curly braces, I'm experiencing issues where ALL products are now showing in only the last prodGroup rather than their relevant/appropriate ones

Answer 1

Use brackets in your loop, and for your own good, everywhere else.
for ($j=0 ; $j<count($prodGroups) ; ++$j)
$query = "SELECT name FROM products WHERE prodGroup='$prodGroups[$j]'";
$result = mysql_query($query); // <- this won't be included in your loop