Remove Duplicate Posts from Custom WordPress Loop

Tuesday, January 14th, 2014

How to: WordPress Remove Duplicate Posts Loop

In WordPress, sometimes you want to run multiple custom queries, but you don’t want the same post to appear in each query. This can happen when you want to feature posts in different categories, but a post may exist in multiple categories, so it is possible for the post to appear under each category.

This article describes the proper way to remove duplicate posts from multiple queries, so that the proper number of posts appear, and the same post won’t appear multiple times.

Find the file you want to edit, and before your custom query, declare a new variable:

/** This is where we are going to store the post ID's for the posts we've already displayed
 * Note: this resets the variable, so be sure to only include it once.
 * Also, if it's included in a template part, beware it may get called multiple
 * times, which would allow posts to be duplicated
$do_not_duplicate = array();

Then, inside your loop, add each post ID to the $do_not_duplicate variable:

$query = new WP_Query($args);
if ($query->have_posts()) {
    while($query->have_posts()) {
        // Add the post ID to the array
        $do_not_duplicate[] = get_the_ID();

        // Your code to display the post goes here...

Finally, to bring it all together, when you are preparing your next custom query arguments, pass in the array into the post__not_in parameter, like so:

$args = array (
    'post_type'        =>  'post',
    'posts_per_page'   => '10',
    'post__not_in'     => $do_not_duplicate
$query = new WP_Query($args);

And there you have it! The posts from the second custom loop will not include any duplicates from the first post.

And, you can string this together for multiple custom queries. Just keep adding post ID’s to the variable, and using the post__not_in parameter, and you will be all set. (Note: do not put the first line in the code again, otherwise it will reset the variable, and you will begin getting duplicates again! This line: $do_not_duplicate = array(); resets the variable, so only declare this once at the top of the file).

Magento Backorders – Complete with Notifications to Customers

Tuesday, July 2nd, 2013

There’s many articles out there that cover how to enable backorders in Magento, and that is simple enough.

However – there are several pieces of this puzzle that are nowhere brought together for a “full” backorder solution.

This solution allows:

  1. Your products to be set to backordered
  2. You to set a custom notification for the product page
  3. Your customers to be notified in the cart page

Enable Backorders in the Dashboard

  1. Log into your Magento admin dashboard.
  2. Hover over the “System” menu.
  3. Click “Configuration”
  4. On the left-side menu, choose “Catalog”
  5. In the Catalog sub-menu, choose “Inventory”
  6. In the pane on the right, find the select box titled “Backorders”, and choose “Allow Qty Below 0 and Notify Customer”

Now that you’ve enabled backorders, a few things happen.  First, products with a quantity of zero are still displayed, and may still be added to the cart.  However, they do not show any indication of being backordered in the product page, which these next two steps will correct:

Modify Your Theme File to Display a Custom Backorder Message

Find the following theme file:

[your theme]/[your_theme]/template/catalog/product/view/type/default.phtml

Open it up, and you should see a line of code that says

$_product = $this->getProduct()

Add the following code immediately after that line:

 // Backorder message
	$backorder_message = '';
	$inventory =  Mage::getModel('cataloginventory/stock_item')->loadByProduct($_product);

	if((int)$inventory->getQty()<=0 && $inventory->getBackorders()>=1) {
		$backorder_message = '

' . $_product->getData('backorder_message') . '

'; }

Then, immediately below / after the


line, add this:

echo $backorder_message;

Add the Custom Backorder Message to the Product
The final step in bringing this all together is adding a new attribute to the product that is going to be backordered.

This is simple to do via the Magento dashboard:

  1. Edit the product in question.
  2. On the left menu, choose “Description”
  3. Near the top of the page, click the orange button titled “Create New Attribute”
  4. Important: be sure to set the Attribute code to backorder_message (this is the exact code that the template changes are looking for, so it has to be correct).
  5. Set the rest of the attribute up as desired.
  6. Save the attribute.
  7. The attribute will now be displayed for you to fill in on the product. Enter your custom message.
  8. Save the product.

You may need to reindex in Magento, or clear cache, but when you do, your message will display if, and only if, you have zero quantity (or less) and the site is set to backorder.

Magento Staging Setup Accessing Live Database with SSL Certificate

Saturday, June 22nd, 2013

With a recent project, we needed to get the Magento staging environment on the same server and accessing the same database as the live environment.  There was lots of setup, product adjusting, etc. that needed to be done, and the client didn’t want to have to do it twice.

Setting up the staging environment was fairly straightforward, thanks to the excellent article over at Mag Life.  However, the article didn’t quite get the job done.

The live site, like all good live ecommerce sites should, was using an SSL certificate to provide a secure connection.  However, the SSL was for a fully qualified domain name ( and the staging site was on a subdomain (  Because the SSL settings are in the database, every time we attempted to hit a secure page, the dev site would no longer load, and instead would attempt to load the live site again.

Additionally, I felt lazy and didn’t want to set up server environment variables like the article at Mag Life, so I made a few other alterations to the code.

When attempting to set this up, follow the directions over at Mag Life, but utilize this code in your Store.php file:

class Alphachannel_Core_Model_Store extends Mage_Core_Model_Store

     *  This function is modified per the Mag Life article.
     *  With one modification to avoid setting server environment variables
    public function getBaseUrl($type=self::URL_TYPE_LINK, $secure=null)
    	// This is the lazy bit.  Rather than setting 
        // environment variables, just set the url's here
    	$urls = array(""=>"");
        $store_code = $this->getCode();
        $url = parent::getBaseUrl($type, $secure);
        // Several nested ifs are removed from Mag Life version 
        // that deal with the environment variables
        $host = parse_url($url, PHP_URL_HOST);
        if (isset($urls[$host]))
            $url = str_replace('://'.$host.'/', '://'.$urls[$host].'/', $url);
            $url = str_replace("https:", "http:", $url);
        return $url;

     * This is the same function as the core files, with one 
     * minor alteration to prevent https redirects
    public function isCurrentlySecure()
        $standardRule = !empty($_SERVER['HTTPS']) && 'off' != $_SERVER['HTTPS'];
        $offloaderHeader = trim(Mage::getStoreConfig('web/secure/offloader_header'));

        if ((!empty($offloaderHeader) && !empty($_SERVER[$offloaderHeader])) || $standardRule) {
            return true;

        if (Mage::isInstalled()) {
            $secureBaseUrl = Mage::getStoreConfig('web/secure/base_route_url');
            if ( ! $secureBaseUrl) 
                // Here's our hack.  Lie to tell it is secure!
            	return true;
                return false;
            $uri = Zend_Uri::factory($secureBaseUrl);
            $isSecure = ($uri->getScheme() == 'https' )
                && isset($_SERVER['SERVER_PORT'])
                && ($uri->getPort() == $_SERVER['SERVER_PORT']);
            return $isSecure;
        } else {
            $isSecure = isset($_SERVER['SERVER_PORT']) && (443 == $_SERVER['SERVER_PORT']);
            return $isSecure;

And, for a little icing on this cake, check out the simple debugging script I whipped up that made it fast and easy to trace back which class / method is calling the current function: Get the calling function or class method

Get the Calling Function or Class Method

Wednesday, June 19th, 2013

During a recent Magento project, I needed to get the calling class and method from a class that was being called multiple times. Due to the construction of Magento, the simplest way would be to use php’s debug_backtrace function. However, in this case when it was output there were over 82,000 lines of debug information. All I was concerned with was the calling function and class, so trying to wade through all of that information was rather overwhelming.

So, I whipped up this little function that takes care of things quite nicely, even formatting the output in the standard class->method structure:

        foreach($callers as $call) {
        	echo "
" . $call['class'] . '->' . $call['function']; }

Using Sessions in WordPress themes and Plugins

Monday, November 12th, 2012

Without hacking core files

WordPress aims to be stateless, so it uses cookies, not sessions.

Which is fine, except for there are things you may need to do that would best be accomplished by tapping into PHP’s sessions.

But, there’s a problem: WordPress iterates over the $_SESSION variable and unsets any session data in wp-settings.php file.

There’s articles out there suggesting editing the wp-settings.php file, but I have a hard and fast rule about not modifying core files for WordPress (or Magento, or Open Cart), because the next time you update your installation (which is important for security), you may wipe your modifications.

There’s a better way.  Why not just hook the session_start AFTER wp-settings.php has run?

Simple as can be with just five lines of code. First, we set up the action to hook into wp-loaded:

add_action('wp_loaded', 'start_my_custom_session');

And then we set our function start_my_custom_session:

function start_my_custom_session() {
	if (!session_id()) {

Customizing and Styling Magento Order Confirmation

Monday, July 23rd, 2012

Magento is powerful, but man does it make some things more laborious than they need to be.

Out of the box, Magento’s order confirmation is weak. The client wanted a more robust solution, and after scraping the web for resources and dumping class methods out, I was able to put together a very robust solution.

WordPress More Tag Not Working on Custom Blog Template

Tuesday, June 21st, 2011

Many of the themes I create have a custom structure – I set up a template for the blog page, which allows separate sidebars, as well as a variety of other features to be available in the themes. Read More →

Beware of WordPress Plugin Bloat

Thursday, May 26th, 2011

I Love WordPress

WordPress is amazing, there’s no two ways about it. I’m a huge fan, and I’ve therefore found myself doing lots of WordPress development and programming for my clients. Read More →

Taming Media Upload in Your Theme or Plugin

Friday, April 8th, 2011

And changing that pesky “Insert Into Post” button

For all you WordPress developers out there, here’s some good news:

You CAN use the built-in WordPress Media Upload functionality in your plugin or theme.  I can’t take credit for figuring THAT out – that goes to Matt with Read More →