Displaying all items from mysql database - php

Question

I have table product and table category in my database. I want to display all category dynamically in a table and inside the table of each category I am displaying all item belonged to that category too.
Those categories and items should be displayed like this :
And here is my coding to do the work :
$fetch_cat = "SELECT * FROM tblcat"; //fetch from table category
$result = $conn->query($fetch_cat);
if ($result->num_rows > 0)
{
while($cat_row = mysqli_fetch_assoc($result))
{
$cat_title = $cat_row['catName'];
echo '<table>';
echo '<tr>';
echo '<td><img src="category/'.$cat_row['catImg'].'" /></td>';
echo '<td>';
echo '<ul class="content_init">';
$stmt = "SELECT * FROM tblproduct WHERE prodCat = '".addslashes($cat_title)."' LIMIT 4"; //fetch from table product
$result = $conn->query($stmt);
if ($result->num_rows > 0)
{
while($row = mysqli_fetch_assoc($result))
{
echo '<li>';
echo '<a href="#"><img style="height: 188px; width: 188px;" src="user_images/'.$row['prodImg'].'" />';
echo '<br /><br />';
echo '<h4>'.$row['prodName'].'</h4>';
echo '<label><span>RM </span>'.$row['prodPrice'].'</label></a>';
echo '</li>';
}
}
echo '</ul>';
echo '</td>';
echo '</tr>';
echo '</table>';
}
}
Problem :
So the problem with my coding is, it can only display Category 1 with items belonged to it. The rest categories unable to be displayed. I guess my coding might not loop properly because of bad programming as it unable to display the expected output.

Answer 1

The $result variable was reused by the inner query thus the first result override.
Change the variable name either of the $result variable.

Answer 2

$result1 = $conn->query($stmt);
if ($result1->num_rows > 0)
{
while($row = mysqli_fetch_assoc($result1))
{
Your approach is not good/optimal. You have query for the categories and then one query per each category,so if you have 10 categories your code would execute 11 queries. You should do it with one query only using INNER JOIN

Answer 3

You can select all the values left joining the category table for the names and group them by their category ID.
See Group array by subarray values
Afterwards, you can traverse each product for each category by accessing the subarrays.