We Analyzed 5 E-Commerce Platforms — Here Are the Results

Introduction

Every e-commerce business faces the same decision: build on an existing open-source platform, or build custom? Conventional wisdom says "don't reinvent the wheel." But what if the wheel has 88,000 type errors?

We took five of the most popular PHP-based open-source e-commerce platforms — OpenCart 4.1, Drupal Commerce, PrestaShop 9.0, WooCommerce 9.6 and Magento 2.4 — and ran them through the same battery of analysis tools. Then we generated equivalent e-commerce modules with Claude Code (Anthropic's AI coding assistant) and ran the identical analysis.

This is not an attack on open source. These platforms power millions of stores and have earned their place in the ecosystem. But the data tells a story about technical debt, hidden costs, and why the economics of custom development have fundamentally changed.

Methodology

We analyzed each platform's e-commerce core (checkout, payment, catalog, authentication) with six tools:

We also ran grep-based reviews of templates and source code for SEO implementation, Schema.org structured data, frontend performance patterns, server-side resource usage and internal linking quality.

For the Claude Code comparison, we generated ~9,500 lines of PHP 8.2 code across four modules (checkout, authentication, payment, catalog) plus three HTML template demonstrations — then ran the exact same tools against them.

1. Overall Static Analysis Results

Raw data: error counts per platform and tool.

Total Error Counts

WooCommerce's 532,182 PHPCS errors deserve context: WordPress uses its own coding standard, not PSR-12. That gap reflects a genuine style incompatibility with the broader PHP ecosystem — but it also means every developer moving between WooCommerce and standard PHP must mentally switch contexts.

Normalized: Errors per 1,000 Lines of Code

Raw counts favor smaller codebases. Here's the comparison per 1,000 lines:

Even normalized, Claude Code produces 4–45x fewer issues per thousand lines than the open-source platforms. Magento comes closest on PHPMD and PHPCS (Adobe has invested significantly in code quality tools), but all platforms show 90–196 PHPStan errors per 1,000 lines compared to Claude Code's 1.6.

2. Security Findings

SQL Construction Patterns

The most critical finding across platforms is how SQL queries are constructed. OpenCart primarily builds queries through string concatenation:

$this->db->query("UPDATE `" . DB_PREFIX . "product` SET
    `model` = '" . $this->db->escape((string)$data['model']) . "',
    `location` = '" . $this->db->escape((string)$data['location']) . "',
    `quantity` = '" . (int)$data['quantity'] . "',
    `price` = '" . (float)$data['price'] . "'
    WHERE `product_id` = '" . (int)$product_id . "'");

This pattern relies on manual escaping instead of parameterized queries. While the type casting provides some protection, it's a known anti-pattern that's just one missing escape() call away from a SQL injection vulnerability.

$stmt = $this->pdo->prepare(
    'UPDATE products SET
        model = :model, location = :location,
        quantity = :quantity, price = :price
     WHERE id = :id'
);
$stmt->execute([
    ':model'    => $data['model'],
    ':location' => $data['location'],
    ':quantity' => $data['quantity'],
    ':price'    => $data['price'],
    ':id'       => $productId,
]);

Zero string concatenation. PDO's prepared statements handle escaping at the driver level, eliminating the entire class of vulnerabilities.

SQL Concatenation Across Platforms

Progpilot Security Findings

Progpilot found 155 potential security issues in PrestaShop's core classes, including tainted data flows to file operations and database queries.

3. Type Safety and Logic Errors

PHPStan Level 5 catches real problems: accessing properties on potentially null objects, wrong types passed to functions, and accessing undefined variables.

Magento 2 leads in raw PHPStan errors (75,226 at Level 5) partly due to its massive codebase and heavy use of code generation.

WooCommerce shows 46,093 Level 5 errors, reflecting WordPress's historically loose typing.

Claude Code's 15 PHPStan L5 errors (1.6 per 1K lines) represent edge cases where PHPStan's inference disagrees with runtime behavior — not structural type safety issues.

PHPStan Level 8 — Strictest Mode

4. Code Quality: Complexity and Design

PHPMD measures cyclomatic complexity, excessively long classes, unused parameters and naming violations.

The most common PHPMD issues: CyclomaticComplexity (methods with 20+ decision branches), ExcessiveMethodLength (methods >100 lines), CouplingBetweenObjects (classes with 13+ dependencies), UnusedFormalParameter and BooleanArgumentFlag.

5. SEO Implementation

We scanned templates and source code for basic SEO elements. The results are concerning.

6. Structured Data / Schema.org

Google's rich results — star ratings, price ranges, availability icons, breadcrumbs — all require structured data.

No platform delivers complete Product schema in its core. Claude Code's templates demonstrate the full suite: Product, Offer, AggregateRating, BreadcrumbList and Organization — all in JSON-LD format.

7. Internal Linking

Internal linking is free SEO capital. Here's how the platforms handle it:

8. Frontend Performance Patterns

Magento 2 stands out with 1,592 images missing loading="lazy" and 1,595 missing srcset.

9. Server-Side Resource Usage

10. The Shopify Factor

We also cloned Shopify's Dawn theme (v15.0.0) and Shopify CLI (latest). In 1,221 TypeScript files we found:

• 258 uses of the any type
• 42 @ts-ignore/@ts-expect-error suppressions
• 9 console.log statements in non-test code

Even Shopify — with billions in revenue — ships code with type safety gaps. The point: technical debt is unavoidable at scale, regardless of budget.

11. What This Means for Your Business

The Hidden Cost of "Free" Platforms

Why Custom Makes Sense Now

This doesn't mean open source is bad

12. Methodology and Limitations

What We Analyzed

• OpenCart 4.1.0.3, Drupal Commerce 8.x-2.x, PrestaShop 9.0.3, WooCommerce 9.6.2, Magento 2.4.8-beta1
• Claude Code: All four modules (checkout, authentication, payment, catalog)

Limitations

• No autoloading — PHPStan produces false positives without composer install
• Template scanning limitations — some platforms render SEO tags dynamically
• Different codebase sizes — normalized per-1K figures compensate
• WooCommerce follows WordPress Coding Standards, not PSR-12
• Point-in-time analysis — findings may be addressed in future versions

Tools and Versions

Conclusion

The data is clear: open-source e-commerce platforms carry significant technical debt. But if you're starting a new project today, you can start clean with modern code that passes strict static analysis, ships with proper SEO and uses prepared statements by default.

AI-assisted development hasn't just made custom code faster to write. It's made it better than what most open-source platforms deliver out of the box.