Drupal commerce programmatically change the quantity of product in a cart by using product id

Programmatically change the quantity of product in a cart by using product id


function product_alter_quanity($product_id, $quantity, $param) {
  $line_item_id = product_in_cart($product_id); // product_in_cart() function - http://php-developer-informations.blogspot.co.uk/2015/06/drupal-commerce-add-line-item-delete.html
  if ($line_item_id != -1 && $line_item_id != -2) {
    if ($param == 'remove') {
      $product_quantity_in_cart = commerce_line_items_quantity(array($line_item_id));
      if ($quantity >= $product_quantity_in_cart) {
        product_delete_cart($product_id);
      }
      else {
        $line_item = commerce_line_item_load($line_item_id);
        $line_item->quantity = $line_item->quantity - $quantity;
        commerce_line_item_save($line_item);
      }
    }
    elseif ($param == 'add') {
      //$line_item_id = product_in_cart($product_id);
      $line_item = commerce_line_item_load($line_item_id);
      $line_item->quantity = $line_item->quantity + $quantity;
      commerce_line_item_save($line_item);
    }
  }
  else {
    return -1;
  }
}

Drupal commerce programmatically delete a line item from the cart by using product id

Programmatically delete a line item from the cart by using product id

function product_delete_cart($product_ids) {
  if (!is_array($product_ids)) {
    $line_item_id = product_in_cart($product_ids); // product_in_cart() function - http://php-developer-informations.blogspot.co.uk/2015/06/drupal-commerce-add-line-item-delete.html
    if ($line_item_id != -1 && $line_item_id != -2) {
      global $user;
      $current_order = commerce_cart_order_load($user->uid);
      commerce_cart_order_product_line_item_delete($current_order, $line_item_id);
    } else
      return -1;
  }
  else {
    $line_item_ids = product_in_cart($product_ids);
    if ($line_item_ids != -1 && $line_item_ids != -2) {
      global $user;
      $current_order = commerce_cart_order_load($user->uid);
      foreach ($line_item_ids as $line_item_id) {
        commerce_cart_order_product_line_item_delete($current_order, $line_item_id);
      }
    }
    else {
      return -1;
    }
  }
}

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