generateBarcode.php

<?php
include('./config/dbcon.php');
// include('./config/function.php');// Include database connection

// Function to generate a unique barcode
function generateBarcode()
{
    global $conn;
    $prefix = "PROD"; // Optional prefix for barcode
    $randomNumber = mt_rand(100000, 999999); // Generate a 6-digit random number

    // Ensure barcode is unique
    $barcode = $prefix . $randomNumber;
    $query = "SELECT * FROM products WHERE barcode='$barcode'";
    $result = mysqli_query($conn, $query);

    while (mysqli_num_rows($result) > 0) {
        $randomNumber = mt_rand(100000, 999999);
        $barcode = $prefix . $randomNumber;
        $result = mysqli_query($conn, "SELECT * FROM products WHERE barcode='$barcode'");
    }

    return $barcode;
}

// Output barcode if requested via AJAX
if (isset($_GET['getBarcode'])) {
    echo generateBarcode();
}
?>