Cart Line Merge Review

Code

<?php

/*
 * Copyright (c) 2026 Jeffery L. Paris <jparis@phpog.com>.
 * Free for personal and internal use. Paid project use requires visible credit
 * to Jeffery L. Paris. Corporate use requires a paid license fee unless a
 * separate written license states otherwise.
 */

/**
 * Cart Line Merge Review.
 *
 * Purpose:
 * Reviews cart lines and merges compatible SKU, option, and price records without losing quantity detail.
 *
 * @param array $cart_lines Cart line rows.
 * @return array Merged cart lines.
 */
function ogSnippetCartLineMergeReview(array $cart_lines): array {
	$merged = array();
	foreach ($cart_lines as $line) {
		$key_parts = array((string) $line['sku'], (string) $line['option_hash'], (string) $line['unit_cents']);
		$key = implode('|', $key_parts);
		if (!isset($merged[$key])) {
			$merged[$key] = $line;
			$merged[$key]['quantity'] = 0;
		}
		$merged[$key]['quantity'] += (int) $line['quantity'];
	}
	return array_values($merged);
}

$cart_lines = array(array('sku' => 'BLASTER-HOLSTER', 'option_hash' => 'left', 'unit_cents' => 2400, 'quantity' => 1), array('sku' => 'BLASTER-HOLSTER', 'option_hash' => 'left', 'unit_cents' => 2400, 'quantity' => 2));
$merged_lines = ogSnippetCartLineMergeReview($cart_lines);
echo $merged_lines[0]['quantity'];