exclude previously displayed products while sorting random and navigating to next page

i m using

if($this->getCurrentOrder() != 'price'){
        if($this->getCurrentOrder() != 'created_at') {
            $this->_collection->setOrder($this->getCurrentOrder(), $this->getCurrentDirection());
        $this->_collection->setOrder($this->getCurrentOrder(), $this->getCurrentDirection());

in toolbar.php to display random items in product page but the products keep repeating !!

  • got my answer ! just want to ask how to stop repeated products during pagination while appling random sort to the product list Commented Mar 18, 2014 at 10:06

1 Answer 1


My thoughts on this approach

First of all I want to say that I disagree with the random order of products in a shop.
It is bad for business because you cannot promote certain products if you want and is bad for user experience.
Here is an example.
I see a list of products and give the url to someone and say "look at the second and forth product on this list". They will see a totally different thing than I do.
Not to mention that the random sorting is slow. (well..I actually mentioned it)

Possible solution

but if you insist here is a possible solution.
You need to order the products by a 'seeded' random order and make sure the 'seed' is the same all through out the session.

Here is a possible approach. I haven't tested it, but I've used this kind of seeded random sorting for listing other entities.

if($this->getCurrentOrder() != 'price'){
    if($this->getCurrentOrder() != 'created_at') {
        //check if there is a seed in the session.
        $seed = Mage::getSingleton('catalog/session')->getListSeed();
        //if there is none, generated it and store it in the session
        if (!$seed) {
            $seed = time(); //can replace with custom logic if you want
        //get a random number based on seed
        $rand = rand(0, 100);
        //pass the random number to the sorting.
        $this->_collection->setOrder($this->getCurrentOrder(), $this->getCurrentDirection());
else {
        $this->_collection->setOrder($this->getCurrentOrder(), $this->getCurrentDirection());
  • "srand($seed); $rand = rand(0, 100); " is it $rand or srand how are you passing the value of $seed to rand as we are giving it a range 0 -100 Commented Mar 18, 2014 at 9:13
  • @wittyvishwas. php.net/manual/en/function.srand.php
    – Marius
    Commented Mar 18, 2014 at 9:14
  • working perfectly fine !! thanks @marius !! Commented Mar 18, 2014 at 9:56
  • I just came across this question and answer after a long time searching. I asked a duplicate of this. Could Marius post this answer on mine and I'll accept it? magento.stackexchange.com/questions/63870/…
    – MW Millar
    Commented Jun 12, 2015 at 8:12
  • @kaska. Instead of duplicating my answer, wouldn't it be better if I close your question as duplicate of this?
    – Marius
    Commented Jun 12, 2015 at 8:24

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