<?php

// An array of associative arrays (representing records)
$users = [
    ["id" => 1, "name" => "Alice", "email" => "alice@example.com"],
    ["id" => 2, "name" => "Bob", "email" => "bob@example.com"],
    ["id" => 3, "name" => "Charlie", "email" => "charlie@example.com"]
];

// Extract only the 'name' column
$names = array_column($users, 'name');
echo "User Names:
";
print_r($names);

// Extract the 'email' column, using 'id' as the keys
$emailsById = array_column($users, 'email', 'id');
echo "
User Emails by ID:
";
print_r($emailsById);

// Example with objects
class Product {
    public $id;
    public $name;
    public $price;
    public function __construct($id, $name, $price) {
        $this->id = $id;
        $this->name = $name;
        $this->price = $price;
    }
}

$products = [
    new Product(101, "Laptop", 1200),
    new Product(102, "Mouse", 25),
    new Product(103, "Keyboard", 75)
];

// Extract product names
$productNames = array_column($products, 'name');
echo "
Product Names:
";
print_r($productNames);

// Extract product prices, using 'id' as the keys
$productPricesById = array_column($products, 'price', 'id');
echo "
Product Prices by ID:
";
print_r($productPricesById);

?>