A PHP and MySQL-based cashier application designed for small-scale retail businesses. Its source code is open and modifiable, and the latest version has even received security patches for CVE-2023-36345 through CVE-2023-36348, covering CSRF and XSS vulnerabilities.

// Old $conn = mysql_connect('localhost', 'user', 'pass'); // New $conn = mysqli_connect('localhost', 'user', 'pass', 'database'); Use code with caution. B. Securing SQL Injection Points

Search for the specific PHP POS project name + "patch" or "fix".

Useful for older projects that may have updated community versions.

For more information on PHP POS source code, including tutorials, documentation, and recommended resources, visit:

Depending on the fix type:

// Replace floating-point calculation with integer math (store in cents) class TaxCalculator public function calculateTax($subtotal_cents, $tax_rate) // Convert to integer to avoid floating point errors $tax_cents = (int)round($subtotal_cents * ($tax_rate / 100)); return $tax_cents;

Never apply a code fix directly to a live (production) site. Follow these steps to avoid destroying your database.

Some popular PHP POS source code repositories include:

If your POS uses nice URLs (e.g., domain.com/sales/add ) and you get 404 errors: