PHP Modify Array Elements with array

The array_map() function in PHP is a powerful tool for modifying array elements. It applies a callback function to each element of an array and returns a new array containing the modified values.

Example 1: Multiplying Company Revenue by a Factor

 
$companies = [
    "Apple" => 274.51,
    "Microsoft" => 168.11,
    "Amazon" => 469.82,
    "Google" => 257.63,
];
 
// Callback function to multiply revenue by a factor of 1.2
$multiplyRevenue = function($revenue) {
    return $revenue * 1.2;
};
 
$updatedCompanies = array_map($multiplyRevenue, $companies);
 
print_r($updatedCompanies);

This example creates an array of companies with their respective revenue values. The multiplyRevenue() callback function takes a revenue value as input and multiplies it by 1.2. The array_map() function applies this callback function to each element of the $companies array, resulting in a new array $updatedCompanies with the modified revenue values.

Example 2: Calculate Discounts on Product Prices

 
$products = [
    ["product_id" => 1, "price" => 100],
    ["product_id" => 2, "price" => 150],
    ["product_id" => 3, "price" => 200],
];
 
$discountedPrices = array_map(function($product) {
    $discount = 0.1;
    $discountedPrice = $product["price"] - ($product["price"] * $discount);
    return ["product_id" => $product["product_id"], "discounted_price" => $discountedPrice];
}, $products);
 
print_r($discountedPrices);

This code creates an array products containing product information. It defines a callback function that calculates a 10% discount on each product's price and returns an associative array with the product ID and discounted price. The resulting array discountedPrices contains the discounted prices of the original products.

Example 3: Increase Order Quantities by 2

 
 
$orders = array("Laptop" => 5, "Phone" => 3, "Tablet" => 2);
 
function increaseQuantity($quantity) {
    return $quantity + 2;
}
 
$increasedQuantities = array_map("increaseQuantity", $orders);
 
print_r($increasedQuantities);

The increaseQuantity function increases each order quantity by 2. The array_map() function applies this function to each element of the $orders array, resulting in a new array with increased quantities.