How to connect to tables and display their content? (MySQL and PHP) - php

Question

I have two mysql tables (products and categories). I have some mock data in both tables. Now I need to somehow attach the categories to the products. For example - The product witht he ID 1 should return the following:
| product name | category |
| Monitor | Technology |
I know I have done this bevore, but today I simply can't seem to find the solution to this.
EDIT
This is waht I have so far. The connection works well and I can display the data in a Table.
<?php
// Include database connection
include("connection.php");
// Create variables for later use
$db = $conn;
$tableName = "Produkte";
$columns= ['id_product', 'name_product'];
// Create variable to use in index.php
$fetchData = fetch_data($db, $tableName, $columns);
// The function below feteches data from the tables specified and checks if the colums are emtpy by any chance.
function fetch_data($db, $tableName, $columns) {
// Check db connection
if (empty($db)) {
$message= "Database connection error";
}
// Check if the columns variable is empty and not an array by any chance
elseif (empty($columns) || !is_array($columns)) {
$message="Product Name must be defined in an indexed array";
}
// Check if table name is empty
elseif (empty($tableName)) {
$message= "Table Name is empty";
}
// Else proceed as usual.
else {
$columnName = implode(", ", $columns);
// The query needs to be repalced. Today my SQL stuff is leaving me a bit.
$query = "SELECT p.".$columnName." AS product, c.name_category FROM $tableName p JOIN Kategorie c ON c.id_";
$result = $db->query($query);
if ($result== true) {
if ($result->num_rows > 0) {
$row= mysqli_fetch_all($result, MYSQLI_ASSOC);
$message= $row;
}
else {
$message= "No Data Found";
}
}
// Throw error if error occures
else{
$message= mysqli_error($db);
}
}
return $message;
}
The table products has only 2 columns. An id column and a product_name column.

Answer 1

It's vary basic technics:
// create DBquery using JOIN statement
$query = "
SELECT
p.name AS product, c.name AS category
FROM products p
JOIN categories c ON c.id = p.category_id;";
// get DB data using PDO
$stmt = $pdo->prepare($query);
$stmt->execute();
// show table header
printf('| product name | category |' . PHP_EOL);
// loop for output result as table rows
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
printf('| %-12s | %10s |' . PHP_EOL, $row['product'], $row['category']);
}
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