Magento 1.9: Print variable value in Mage::Log

Question

My observer :

   public function checkproductinorder($Observer)
    {
        $order = $Observer->getEvent()->getOrder();
        $items = $order->getAllItems();
        foreach ($items as $item) 
        {
          if($item->getSku() == '600' || '800')
            {
              Mage::log('The selected product list available in order', null, 'matchorder.log');
            }
        }

If the SKU's 600 or 800 order how can I print the SKU value in Mage::Log like,

The selected product list available in order. SKU list : 600, 800

Answer 1

Try below code in your observer, it'll work for you.

public function checkproductinorder($Observer)
{
    $order = $Observer->getEvent()->getOrder();
    $items = $order->getAllItems();
    $skus = array('600','800'); //product SKUs
    $skuList = array();
    foreach ($items as $item) 
    {
      if(in_array($item->getSku(), $skus))
        {
            $skuList[] = $item->getSku();
        }
    }
    if(!empty($skuList)) {
        Mage::log('The selected product list available in order '.implode(',',$skuList), null, 'matchorder.log');
    }
}

Answer 2

Try this code

public function checkproductinorder($Observer)
{
    $order = $Observer->getEvent()->getOrder();
    $items = $order->getAllItems();
    $skus = array();
    foreach ($items as $item) 
    {
      if($item->getSku() == '600' || $item->getSku() == '800')
        {
         $skus[] = $item->getSku();
        }
    }
    Mage::log('The selected product list available in order. SKU list: '.implode(",",$skus), null, 'matchorder.log');

}

It will print the sku list in comma separated way in log as you mentioned in your question. I hope this will help