change page title magento

$this->getLayout()->getBlock('head')->setTitle($this->__('pagetitle'));

magento basics concept

Magento built in zend framework on object orient concept in MVC architecture Based on EDA(Event Driven Architecture).
Whent an event happens element listen event and sent to event engine.  

Index management magento programmatically

get All Index process collection

$allIndex= Mage::getSingleton('index/indexer')->getProcessesCollection();

foreach ($allIndex as $index) {
if ($index->getStatus() == Mage_Index_Model_Process::STATUS_REQUIRE_REINDEX) {
$index->reindexEverything();
//echo "<pre>"; print_r($index->getProcess_id()); echo "</pre>";
}
}

get payment method in cart magento

for handling payment method display in cart we use event handling  we use config.xml in module or in custom module

app/code/local/regitration/field/etc/config.xml

<?xml version="1.0"?>
<config>
<frontend>
<events>
    <payment_method_is_active>
        <observers>
            <Regitration_Field_Model_observer>
                <class>Regitration_Field_Model_observer</class>
                <method>payment_method_is_active</method>
            </Regitration_Field_Model_observer>
        </observers>
    </payment_method_is_active>
</events>
  </frontend>
</config>



define action in observer file


app/code/local/regitration/field/model/observer.php

<?php
class Regitration_Field_Model_observer {

public function payment_method_is_active($observer){
     $event           = $observer->getEvent();
    $method          = $event->getMethodInstance();
    $result          = $event->getResult();
    $session = Mage::getSingleton('checkout/session')->getQuote();
$shippiingcarriers =  $session->getShippingAddress()->getShippingMethod();
            if ($shippiingcarriers == 'flatrate_flatrate' ){
                    if($method->getCode() == 'cashondelivery' OR $method->getCode() == 'checkmo' OR $method->getCode() == 'paypal_standard' or $method->getCode()=='purchaseorder'){
                        $result->isAvailable = false;
                    }else{
                        $result->isAvailable = true;
                }
            }

}
}
 ?>

get cross cell product collection magento

$cart = Mage::getModel('checkout/cart')->getQuote();
$productid = array();
$crossc = array();
foreach ($cart->getAllItems() as $item) {
    $productid[] = $item->getProduct()->getId();
foreach($item->getProduct()->getCrossSellProducts() as $crosscell){
$crossc[] = $crosscell['entity_id'];
}
}
$crossce = array_diff($crossc, $productid);
$collection = Mage::getResourceModel('catalog/product_collection')->addAttributeToSelect('*');
$collection->addIdFilter($crossce);
$collection->setPageSize(4);

upcell product collection magento

$pid = 2;
$product = Mage::getModel('catalog/product')->load($pid);
$collect = $this->getProduct()->getUpSellProductCollection();
$collect->getItems();

custom price in cart Magento

Add event in module  etc/config.xml

<?xml version="1.0"?>
<config>
</frontend>
        <events>
            <checkout_cart_product_add_after>
                <observers>
                    <Custom_Event_Model_Observer>
                        <type>singleton</type>
                        <class>Custom_Event_Model_Observer</class>
                        <method>Mytestmethod</method>
                    </Custom_Event_Model_Observer>
                </observers>
            </checkout_cart_product_add_after>
        </events>
</frontend>
</config>




calculate your price in Custom/Event/Model/Observer.php



class Custom_Event_Model_Observer {

    public function Mytestmethod(Varien_Event_Observer $observer) {
 $item = $observer->getQuoteItem();
$item = ( $item->getParentItem() ? $item->getParentItem() : $item );
        $price = 66;
        $item->setCustomPrice($price);
        $item->setOriginalCustomPrice($price);
        $item->getProduct()->setIsSuperMode(true);

    }
}

Remove product image magento

$_product = Mage::getModel('catalog/product')->setStoreId($storeId)->load(2);
$removes[0] = a/b/aaa.png;
$removes[1] = a/c/bbb.png;
if(count($remove)>0){
 $attributes = $_product->getTypeInstance ()->getSetAttributes ();
 $gallery = $attributes ['media_gallery'];
$galleryData = $_product->getMediaGallery();
foreach($removes as $remove) {
foreach($galleryData['images'] as $image) {
if($remove==$image['file']){
$gallery->getBackend ()->removeImage( $_product, $image ['file'] );
}
}
}
$_product->save ();
}

multi select in custom module magento

$tool_cat_Arr = array(array('value' => '1', 'label' => 'Shirt'), array('value' => '2', 'label' => 'Tshirt'), array('value' => '3', 'label' => 'Custom'));


$fieldset->addField("tool_cat", "multiselect", array(
"label" => Mage::helper("storeinfo")->__("Tool Category"),
"name" => "tool_cat",
"values" => $tool_cat_Arr

));

filter in custom module magento

$stored = 25;

$storeinfo = Mage::getModel("storeinfo/storeinfo")->getCollection()->addFilter('storeowner_id',$stored)->load();

$storeinfoid = $storeinfo->getAllIds();

$Storeinfomodel = Mage::getModel("storeinfo/storeinfo")->load($storeinfoid[0]);