Drupal Commerce find the line item id by using product id

Programmatically find the line item id by using product id


function product_in_cart($product_id) {
  if (!is_array($product_id)) {
    global $user;
    $current_order = commerce_cart_order_load($user->uid);
    if (count($current_order->commerce_line_items) > 0) {
      $line_items = $current_order->commerce_line_items;
      foreach ($line_items['und'] as $key => $value) {
        $line_item = commerce_line_item_load($value['line_item_id']);
        $products = $line_item->commerce_product['und'];
        foreach ($products as $product_key => $product_value) {
          if ($product_id == $product_value['product_id']) {
            return $value['line_item_id'];
          }
        }
      }
      return -1;
    } else
      return -2;
  }
  else {
    global $user;
    $current_order = commerce_cart_order_load($user->uid);
    if (count($current_order->commerce_line_items) > 0) {
      $line_items = $current_order->commerce_line_items;
      foreach ($line_items['und'] as $key => $value) {
        $line_item = commerce_line_item_load($value['line_item_id']);
        $products = $line_item->commerce_product['und'][0]['product_id'];
        foreach ($product_id as $id) {
          if ($id == $products) {
            $line_item_ids[] = $value['line_item_id'];
          }
        }
      } if (isset($line_item_ids) >= 1) {
        return $line_item_ids;
      }
      else {
        return -1;
      }
    } else
      return -2;
  }
}

Drupal Commerce add line item

Function for programmatically add a product as line item by using product id

function product_cart_add($product_id, $quantity, $uid = NULL) {
  $line_item = NULL;
  if ($uid == NULL) {
    global $user;
    $uid = $user->uid;
  }
  if ($product = commerce_product_load($product_id)) {
    $line_item = commerce_product_line_item_new($product, $quantity);
    $line_item = commerce_cart_product_add($uid, $line_item);
  }
  return $line_item;
}

Drupal user login form customization

Customizing the user login page is very simple, and uses the following concepts:

Use preprocess to set variables
register you template file in hook_theme
create templates and render your variables

Step 1:
/**
 * Implements hook_theme().
 */
function hook_theme() {
  $items = array();
  $items['user_login'] = array(
      'render element' => 'form',
      'path' => PATH . '/templates',
      'template' => 'user-login',
      'preprocess functions' => array(
          'hook_preprocess_user_login'
      ),
  );
  return $items;
}

Step 2:
function hook_preprocess_user_login(&$variables) { 
  $variables['render_text'] = 'You can add extra text and message';
}

Step 3:
Create you template file in  your template folder
user-login.tpl.php

<div class="login-wrapper">

      <h2><?php print t('SIGN IN'); ?></h2>

      <?php
      // split the username and password from the submit button so we can put in links above
      print drupal_render($form['name']);
      print drupal_render($form['pass']);
      ?>

      <div class="login-links">
        <?php print l(t('FORGOT YOUR PASSWORD?'), 'user/password', array('attributes' => array('class' => 'login-link'))); ?>
      </div>

      <?php
      print drupal_render($form['form_build_id']);
      print drupal_render($form['form_id']);
      print drupal_render($form['actions']);
      ?>

    </div><!--//login-wrapper-->


Step 4:
Clear drupal cache

Add custom file extension in PHP application

We can add custom file extension in Apache PHP application. We can add our custom file extension instead of .php

For example, index.xyz instead of index.php

Open httpd.conf located in apache/conf folder
Find " <IfModule mime_module> "
Add " AddType application/x-httpd-php .xyz "
Restart your apache server

Status messages not removing with Commerce Ajax Cart

Use ajax_command_remove() command to remove the existing error messages while submit ajax add to cart button

$commands[] = ajax_command_remove('div.messages');
$commands[] = ajax_command_after('#main-content', theme('status_messages'));