DavidCampbell

your style sheet should not have this syntax: <style> </style> just do it like this: body { background: url("images/background-forum.jpg"); } and include it in your html head: <link href="pathTo/style.css" media="all" rel="stylesheet" type="text/css">

actually I think I've solved it: BigDecimal a00 = new BigDecimal(a[0][0]); BigDecimal a01 = new BigDecimal(a[0][1]); BigDecimal a02 = new BigDecimal(a[0][2]); BigDecimal a10 = new BigDecimal(a[1][0]); BigDecimal a11 = new BigDecimal(a[1][1]); BigDecimal a12 = new BigDecimal(a[1][2]); BigDecimal a20 = new BigDecimal(a[2][0]); BigDecimal a21 = new BigDecimal(a[2][1]); BigDecimal a22 = new BigDecimal(a[2][2]); BigDecimal a00a11a22 = new BigDecimal("0.0"); BigDecimal a01a12a20 = new BigDecimal("0.0"); BigDecimal a02a10a21 = new BigDecimal("0.0"); BigDecimal a20a11a02 = new BigDecimal("0.0"); BigDecimal a21a12a00 = new BigDecimal("0.0"); BigDecimal a22a10a01 = new BigDecimal("0.0"); BigDecimal bigDecimalDeterminantMinuend = new BigDecimal("0.0"); BigDecimal bigDecimalDeterminantSubtrahend = new BigDecimal("0.0"); a00a11a22 = a00.multiply(a11).multiply(a22); a01a12a20 = a01.multiply(a12).multiply(a20); a02a10a21 = a02.multiply(a10).multiply(a21); bigDecimalDeterminantMinuend = a00a11a22.add(a01a12a20).add(a02a10a21); a20a11a02 = a20.multiply(a11).multiply(a02); a21a12a00 = a21.multiply(a12).multiply(a00); a22a10a01 = a22.multiply(a10).multiply(a01); bigDecimalDeterminantSubtrahend = a20a11a02.add(a21a12a00).add(a22a10a01);

anyone know how to multiply multiple BigDecimals? not like this example: BigDecimal subTotal, taxRate, tax, total; subTotal = new BigDecimal("32.50"); taxRate = new BigDecimal("0.05"); tax = subTotal.multiply(taxRate); total = subTotal.add(tax); I need to multiple more than two numbers and also do addition. This is the line i'm trying to convert to BigDecimals: double aDeterminantMinuend = (a[0][0] * a[1][1] * a[2][2]) + (a[0][1] * a[1][2] * a[2][0]) + (a[0][2] * a[1][0] * a[2][1]); as you can see those are doubles in an array that i'm doing my arithmetic to. so I've prepped them like: BigDecimal a00 = new BigDecimal(a[0][0]); BigDecimal a01 = new BigDecimal(a[0][1]); BigDecimal a02 = new BigDecimal(a[0][2]); BigDecimal a10 = new BigDecimal(a[1][0]); BigDecimal a11 = new BigDecimal(a[1][1]); BigDecimal a12 = new BigDecimal(a[1][2]); BigDecimal a20 = new BigDecimal(a[2][0]); BigDecimal a21 = new BigDecimal(a[2][1]); BigDecimal a22 = new BigDecimal(a[2][2]); so now I need to do the BigDecimal arithmetic to them, but the only examples i can find are like the one posted above. Just two BigDecimals multiplied together. i've tried embedding multiple calls the multiple() method, but that doesnt work. I'm thinking the only way to do it is to make new BigDecimals for each step of the arithmetic, but surely theres a better, neater way?

when you open a <div> always close the div </div> I like to mark my closing divs, so I don't lose track. In PHP I would have comment like: // END div.classOfDiv print "</div>"; or in html: <!-- END div.classOfDiv --> </div> yes you can embed divs within other divs.

I disagree with the don't use classes comment. No! Use classes all the time, not id's. It's rare that you are styling one specific element. Maybe something like a logo. But most things are going to be groups of elements, so use a class for that group, for that "class" of element. Thats what its for. If you want to minimise the classes you're adding to elements, just add a class to the one element that is the parent to a group (in the DOM), usually a div. Then you can use that to target all elements within. div.myListItem p Styles all paragraphs within any div with a class of 'myListItem'.

What do we think of Brian Will's assertion that Object-Oriented Programming is Bad?

Choose PHP 😄

With photoshop don't get too attached to the details, as once you start coding, things tend to look different. Especially once you start accounting for the way different browsers interpret your beautifully crafted design. Being pedantic about pixel perfect design will just lead you to despair. You need to think of design as fluid, it's not like graphic design for print. Not at all. Don't be scared of using CSS, the work flow can be very fast once you know what you're doing. Just as fast as fumbling around in photoshop or illustrator. I'm in the camp of preferring to dive straight in with the code. UX problems i'll just sketch out with pencil and paper roughly, then go code it. I use photoshop to appease people who need to see some eye candy. But I manage expectations by stating that what you see in photoshop is not necessarily how the final implementation will look.

Videos: Composer Introduction & SDK Setup PayPal Settings & Minor Changes Steps to Submitting a Payment Integrating PayPal Part 1 Integrating PayPal Part 2 Integrating PayPal Part 3 Integrating PayPal Part 4 On the whole the videos can be followed, but there are few red herrings on the way. And unnecessary distractions. Composer Introduction & SDK Setup Forget Composer, this is an unnecessary distraction and just confuses things, maybe mention Composer at the end of the tutorial as an alternative method for installing the SDK. Get the SDK hosted on Github from here: https://github.com/paypal/PayPal-PHP-SDK/releases I used the 1.13.0 zip (latest version) from this page and it works fine. To follow the videos you would rename the uncompressed SDK folder to 'vendor' and place it in the /app directory. The 'samples' are slightly different. They are now hosted online here" https://paypal.github.io/PayPal-PHP-SDK/sample/ Only one sample is actually used in the tutorial, this one: https://paypal.github.io/PayPal-PHP-SDK/sample/doc/payments/CreatePaymentUsingPayPal.html as you can see it looks virtually the same. If you want to host the samples locally, you can still do that. Go to the main SDK repository on Github https://github.com/paypal/PayPal-PHP-SDK you can see the samples directory is there. I did however have trouble downloading directly from here. For some reason when you hit the clone/download button and download from here the zip is missing files and directories you'd expect to be there, including the samples directory. I have no clue why this is. I managed to work around this problem by forking the repository and using the GitHub desktop app to clone my fork to my local drive. It was then fairly simple to drag the 'samples' directory out and host that with my MAMP/LAMP. PayPal Settings & Minor Changes Do the changes to init.php etc Then the first step really is to goto https://developer.paypal.com/ log in and go to the dashboard (it all looks very different, but it's essentially doing the same job as before). Scroll down to REST API apps and create a new App. A client ID, secret and two test accounts (buyer and facilitator) are created automatically. Continue and make the changes to init.php, v_public_cart.php, success.php, v_public_success.php and m_payments.php etc. Steps to Submitting a Payment This video is a bit confusing now, as the interactive guide is not the same. The vid really needs to be just a simple explanation of the steps used with paypal. Integrating PayPal Part 1 Integrating PayPal Part 2 Integrating PayPal Part 3 Integrating PayPal Part 4 Once all the above is sorted you can follow these video's pretty much verbatim, only there are some subtle differences with the bootstrap.php file that you'll be copying from. It's easier to just look at my m_payments.php file: <?php /* Payments Class Handle all tasks related to payments */ require ('app/vendor/autoload.php'); use PayPal\Rest\ApiContext; use PayPal\Auth\OAuthTokenCredential; use PayPal\Api\Amount; use PayPal\Api\Details; use PayPal\Api\Item; use PayPal\Api\ItemList; use PayPal\Api\Payer; use PayPal\Api\Payment; use PayPal\Api\RedirectUrls; use PayPal\Api\Transaction; use PayPal\Api\PaymentExecution; class Payments { private $api_context; function __construct() { $this->api_context = $this->get_api_context(); // echo '<pre>'; // print_r($this->api_context); // echo '</pre>'; // exit; } /* Getters and Setters */ public function get_api_context() { if (PAYPAL_MODE == "sandbox") { $apiContext = new ApiContext( new OAuthTokenCredential ( PAYPAL_DEVID, PAYPAL_DEVSECRET ) ); } else { $apiContext = new ApiContext( new OAuthTokenCredential ( PAYPAL_LIVEID, PAYPAL_LIVESECRET ) ); } $apiContext->setConfig(array ( 'mode' => PAYPAL_MODE, 'http.ConnectionTimeOut' => 30, 'log.LogEnabled' => true, 'log.FileName' => 'app/PayPal.log', 'log.LogLevel' => 'FINE' )); return $apiContext; } /** * Creates PayPal payment: * * @access public * @param * @return error string **/ public function create_payment($items_array, $details_array) { $payer = new Payer(); $payer->setPaymentMethod("paypal"); // set items $i = 0; foreach ($items_array as $item) { $items[$i] = new Item(); $items[$i] ->setName($item['name']) ->setCurrency(PAYPAL_CURRENCY) ->setQuantity($item['quantity']) ->setSku("123123" . $i) ->setPrice($item['price']); $i++; } $itemList = new ItemList(); $itemList->setItems($items); // set details $details = new Details(); $details ->setShipping($details_array['shipping']) ->setTax($details_array['tax']) ->setSubtotal($details_array['subtotal']); // set amount $amount = new Amount(); $amount ->setCurrency(PAYPAL_CURRENCY) ->setTotal($details_array['total']) ->setDetails($details); // set transaction $transaction = new Transaction(); $transaction ->setAmount($amount) ->setItemList($itemList) ->setDescription("") ->setInvoiceNumber(uniqid()); // create urls $redirectUrls = new RedirectUrls(); $redirectUrls ->setReturnUrl(SITE_PATH . "success.php") ->setCancelUrl(SITE_PATH . "cart.php"); // create payment $payment = new Payment(); $payment ->setIntent("sale") ->setPayer($payer) ->setRedirectUrls($redirectUrls) ->setTransactions(array($transaction)); try { $payment->create($this->api_context); } catch (Exception $ex) { // echo '<pre>'; // print_r($ex->getData()); // echo '</pre>'; // exit; return $ex->getMessage(); } // get redirect url $approvalUrl = $payment->getApprovalLink(); $_SESSION['payment_id'] = $payment->getId(); if (isset($approvalUrl)) { header("Location: $approvalUrl"); exit; } } /** * Executes PayPal payment: * * @access public * @param string, string * @return result object **/ public function execute_payment($payer_id, $payment_id) { $payment = Payment::get($payment_id, $this->api_context); $execution = new PaymentExecution(); $execution->setPayerId($payer_id); $result = $payment->execute($execution, $this->api_context); return $result; } } As you can see it's almost the same, just some subtle difference at the bottom with the re-directs and the try/catch. I did have to fix that bug that was a result of a comma being in the amount (see earlier post for the fix). Anyway I think that was everything. Dave

No worries Stef, I'll write up some instructions. I have it all working as expected.

bug fixed: here is my new checkout.php <?php include('app/init.php'); if(isset($_POST)) { // create Payment Object include('app/models/m_payments.php'); $Payments = new Payments(); // get item data $items = $Cart->get(); // get details $details['subtotal'] = $Cart->get_total_cost(); $details['shipping'] = 0; foreach ($items as $item) { $details['shipping'] += $Cart->get_shipping_cost($item['price']); } $details['shipping'] = number_format($details['shipping'], 2, '.', ''); $details['tax'] = number_format($details['subtotal'] * SHOP_TAX, 2, '.', ''); $details['total'] = number_format( $details['subtotal'] + $details['shipping'] + $details['tax'], 2, '.', ''); // send to PayPal $error = $Payments->create_payment($items, $details); if ($error != NULL) { $Template->set_alert($error, 'error'); $Template->redirect('cart.php'); } } else { $Template->redirect('cart.php'); } note the changes to number_format() where appropriate.

Any progress on this course idea? I've been doing JAVA, and it wasnt until I started learning Java that I really "got" programming. I had played with PHP before that. Anyway I fully intend to become a good Java programmer, because it's the highest paying here in the UK. If freelancing/being an entrepreneur doesn't work out. Although a computer science degree seems to be required for a lot of these Java jobs.

Well I've kinda got it working, only it doesnt like me buying 10 TV's LOL. I can buy 2 headphones though, so not sure whats going with the quantity bug. This is the error I get: Fatal error: Uncaught exception 'InvalidArgumentException' with message 'Total is not a valid numeric value' in /Volumes/5TB_Seagate/htdocs/phpCart/app/vendor/paypal/rest-api-sdk-php/lib/PayPal/Validation/NumericValidator.php:23 Stack trace: #0 /Volumes/5TB_Seagate/htdocs/phpCart/app/vendor/paypal/rest-api-sdk-php/lib/PayPal/Api/Amount.php(54): PayPal\Validation\NumericValidator::validate('3,302.39', 'Total') #1 /Volumes/5TB_Seagate/htdocs/phpCart/app/models/m_payments.php(132): PayPal\Api\Amount->setTotal('3,302.39') #2 /Volumes/5TB_Seagate/htdocs/phpCart/checkout.php(31): Payments->create_payment(Array, Array) #3 {main} thrown in /Volumes/5TB_Seagate/htdocs/phpCart/app/vendor/paypal/rest-api-sdk-php/lib/PayPal/Validation/NumericValidator.php on line 23

Actually this link here seems to be the most relevant so far: https://paypal.github.io/PayPal-PHP-SDK/sample/doc/payments/CreatePaymentUsingPayPal.html Which is the top link on this page: https://paypal.github.io/PayPal-PHP-SDK/sample/ Seems to be an online version of the locally installed PayPal sample used in the tutorial. https://github.com/paypal/PayPal-PHP-SDK/tree/master/sample

OK I think i've just discovered the new place under API Explorer which takes you to here https://www.paypal.com/apex/product-profile/expressCheckout/getAccessToken (the second image). I haven't confirmed it by going through the steps, but it looks promising.