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Step-> 1 :: Go to app/design/frontend/base/default/template/catalog/product/view/addtocart.phtml

In the addtocart.phtml file find the following code(around line 33)

<input name="qty" type="text" class="input-text qty" id="qty" maxlength="12" value="<?php echo $this->getMinimalQty($_product) ?>" />

Step-> 2 :: Replace with this code:

This code shows the "Available Qty for Product".

To login into magento admin, using only ftp access is a little tricky. Through FTP open the class Mage_Admin_Model_User located at

app\code\core\Mage\Admin\Model\User.php

Next find the

$this->loadByUsername($username);

New tab in product detail page is very easy task with product attribute. Use below steps and check it out.

Step 1. Create Product Attribute “video”.
Step 2. Create file catalog_product_view.xml in the app/design/frontend/{vender name}/{theme name}/Magento_Catalog/layout

In the file write the below code:

Get all items information in cart

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$cart = $objectManager->get('\Magento\Checkout\Model\Cart'); 

// retrieve quote items collection
$itemsCollection = $cart->getQuote()->getItemsCollection();

// get array of all items what can be display directly
$itemsVisible = $cart->getQuote()->getAllVisibleItems();

Open following file :

{root}/vendor/magento/framework/Mail/Template/TransportBuilder.php

and find prepareMessage() function at line number 265

Just echo $body and exit the exceution of code.

	<?php
	//increase execution time
	ini_set('max_execution_time', 900); //900 seconds = 15 minutes

	//require Magento
	require_once 'app/Mage.php';
	$app = Mage::app('admin');
	umask(0);

	//enable Error Reporting

	<?php
	include 'app/Mage.php';
	Mage::app();

	$productId = 4299;
	//load the product
	$product = Mage::getModel('catalog/product')->load($productId);
	//get all images
	$mediaGallery = $product->getMediaGallery();
	//if there are images

	<?php
	require_once ( "app/Mage.php" );
	Mage::app();
	umask(0);
	//echo Mage::getBaseUrl();
	$url = Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_WEB);
	//exit;
	$_productCollection = Mage::getModel('catalog/product')
	->getCollection()
	->addAttributeToSort('created_at', 'DESC')

	// Type one of the next lines and you will obtain jQuery version:
	console.log(jQuery.fn.jquery);
	// OR
	console.log(jQuery().jquery);

	<?php

	$bootstrap = \Magento\Framework\App\Bootstrap::create(BP, $_SERVER);
	$obj = $bootstrap->getObjectManager();
	$deploymentConfig = $obj->get('Magento\Framework\App\DeploymentConfig');
	$tablePrefix = $deploymentConfig->get('db/table_prefix');