PHP, MySQL, JS, jQuery, Ajax, .htaccess,robots.txt,phponwebsites: April 2016

28 Apr 2016

Create a node programmatially in Drupal 7

      This blog describes about how to create a new node programmatically in Drupal 7. If you want to add a new node, you can done at node/add by default. In Drupal, you can also add a node programmatically. Let see the below code.

<?php
// create object
  $node = new stdClass();
  // set title for a node
  $node->title = t('Created node programmatically');
  // set node type
  $node->type = 'article';
  // set node language
  $node->language = LANGUAGE_NONE;
  // set value to node body
  $node->body[LANGUAGE_NONE][0]['value'] = t('This node has been created programmatically in Drupal 7');
  // set value to node body summary
  //$node->body[LANGUAGE_NONE][0]['summary'] = text_summary(t('This node has been created programmatically in Drupal 7'));
  // set node body format like plain_text, filtered_html, full_html
  $node->body[LANGUAGE_NONE][0]['format'] = 'filtered_html';
  node_object_prepare($node);
  // author for a node
  $node->uid = 1;
  // status of node  0 - unpublished, 1 - published
  $node->status = 1;
  // promoted to front page or not
  $node->promote = 0;
  // sitcky at top of tha page
  $node->sticky = 0;
  // comments 0 - hidden, 1 - closed, 2 - opened
  $node->comment = 1;

  // add term
  $node->field_tags[$node->language][]['tid'] = 1;

  // get the file path
  $file_path = drupal_get_path('module', 'phponwebsites') . '/Desert.jpg';
  // create file object
  $file = (object) array(
    'uid' => 1,
    'uri' => $file_path,
    'filemime' => file_get_mimetype($file_path),
    'status' => 1,
  );
  // Save the file to the public directory. You can specify a subdirectory, for example, 'public://images'
  $file = file_copy($file, 'public://');
  // assign the file object into image field
  $node->field_image[LANGUAGE_NONE][0] = (array)$file;
  // Prepare node for a submit
  $node = node_submit($node);
  //save the node
  node_save($node);


    After ran this code, you can see newly created node at admin/content. When you view that node, it looks like below image:

Create a new node programmatially in Drupal 7 at Phponwebsites


     Now I’ve hope you know how to create a new node programmatically in Drupal 7.

21 Apr 2016

Redirect users after login in Drupal 7

    This blog describes about how to redirect users after logged into a site in Drupal 7. By default, Drupal redirects users to user page after logged into a site.  Suppose you want to redirect users into any other pages as you want. Then you can done that in Drupal 7.
  You can redirect users after login in Drupal using the following two ways:
1. Redirect users after logged into a site using hook_user_login()
2. Redirect users after logged into a site using custom form submit

Redirect users after form submit in Drupal 7

Redirect users after logged into a site using hook_user_login:


     Drupal provides hook called hook_user_login to make changes while user login successfully. Let see the below code.

/**
 * Implement hook_user_login()
 */
function phponwebsites_user_login(&$form, &$form_state) {
 //add page here to where you want redirect users after login
  $form['redirect'] = '<front>';
}

    Now you can check whether you redirect to front page or not after login. Now  Drupal will be redirect you to front page.

Redirect users after logged into a site using custom form submit:


   Drupal have alternate method to redirect users after login. Ie, You need to add custom form submit handler to a form using hook_form_alter(). Then add a page to redirect users in that custom form submit handler in Drupal 7. Let see the below code.


/**
 * Implement hook_form_alter().
 */
function phponwebsites_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == "user_login" || $form_id == "user_login_block") {
    $form['#submit'][] = 'phponwebsites_custom_login_submit';
  }
}  
function phponwebsites_custom_login_submit(&$form, &$form_state) {
  //page to be redirect
  $form['redirect'] = '<front>';
}


Now you will be redirect to front page after logged into a drupal site. Now I’ve hope you should know how to redirect users after logged into a site in Drupal 7.

19 Apr 2016

Create page without header and footer in Drupal 7

    This blog describes about create only page contents without header and footer in Drupal 7. All of you know almost all of the pages in Drupal have header and footer. Suppose you want to create a page without header and footer in Drupal 7. Is it possible? Yes, it is possible in Drupal 7. You can create a page without header and footer using 'delivery callback' in hook_menu.

Render a page without header and footer in Drupal 7:


     Drupal provide a option to create page without header and footer. Let see the below code for render a page without header and footer in Drupal 7.

/**
 * Implement hook_menu().
 */
function phponwebsites_menu() {
  $items['sample-wo-header-footer'] = array(
    'title' => 'A page without header and footer in Drupal 7',
    'access callback' => TRUE,
    'page callback' => 'phponwebsites_without_header_footer',
    'type' => MENU_CALLBACK,
    'delivery callback' => 'deliver_plain',
  );
  return $items;
}

function deliver_plain($page_callback_result) {
  print $page_callback_result;
}

/**
 * Implement phponwebsites_without_header_footer().
 */
function phponwebsites_without_header_footer() {
  return 'This is the page without header and footer';
}


   You could see the page without any header and footer when you view page in a browser. Now I've hope you how to render a page without header and footer in Drupal 7.

16 Apr 2016

Clear views cache when insert, update and delete a node in Drupal 7

This blog describes how to clear views cache while inserting, updating and deleting a node in Drupal 7. If we want to improve site performance, then views caching is one of the options.

   For example, you have views which display list of records. It will update occasionally. Then we can render views data from cache rather than server if we set cache for views. We can set views cache at its settings page. Suppose you have cached views for 5 mins. Then it didn't display updated data until 5 mins even if new node is added to that views. It displays updated data only after 5 mins because the views is cached for 5 mins. In that situation, the user can't view new data in cached views. So we need to clear views cache when add , update and delete a node. So only we can see new data in views and also data is rendered from cache.

Clear views cahce when insert, update and delete a node in drupal 7


Clear views cache when insert a new node in Drupal 7:

   The newly added node has not been displayed in views list if the cache is applied to a views. So we need to clear views cache when insert a new node using hook_node_insert(). Lets see the code for clear views cache while inserting a node:

 <?php
 /**
  * Imeplement hook_node_insert().
  */
 function phponwebsites_node_insert($node) {
   if ($node->type == 'tasks') {
     //clear views cache
     $viewsname = 'activity';
     cache_clear_all($viewsname, 'cache_views_data', TRUE);
   }
 }

Clear views cache when update a node in Drupal 7:

   When you tried to update a node, the updated data in that node has not been displayed in views. So we need to clear views cache when update a node using hook_node_update(). Lets see the code for clear views cache while updating a node:

 <?php
 /**
  * Imeplement hook_node_update().
  */
 function phponwebsites_node_update($node) {
   if ($node->type == 'article') {
     //clear views cache
     $viewsname = 'articles';
     cache_clear_all($viewsname, 'cache_views_data', TRUE);
   }
 }

Clear views cache when delete a node in Drupal 7:

   After delete a node, you could see the deleted node is displayed in the views. So we need to clear views when delete a node using hook_node_delete(). Lets see the code for clear views cache while deleting a node:

 <?php
 /**
  * Imeplement hook_node_delete().
  */
 function phponwebsites_node_delete($node) {
   if ($node->type == 'article') {
     //clear views cache
     $viewsname = 'articles';
     cache_clear_all($viewsname, 'cache_views_data', TRUE);
   }
 }

   You can see the performance of views page will be increased and you can see changes in your views. Now I've hope you know how to clear views cache when insert, update and delete a node in Drupal 7.

15 Apr 2016

Login using email and username in Drupal 7

   This blog describes about how to login using both email and username in Drupal 7. All of you know we could login using only username in Drupal 7.

Login using mail address and usename in Drupal 7


       I've tried to login using email without any contrib modules. Finally i got the code. First alter form to add custom form validation. In custom form validation, get the name from user table by email and set that value into name field in form.  Let see the code:

<?php
/**
 * Implement hook_form_alter().
 */
function phponwebsites_form_alter(&$form, &$form_state, $form_id) {

  if ($form_id == "user_login" || $form_id == "user_login_block") {
    $form['name']['#title'] = t('Username or E-mail Address');
    // Ensure a valid validate array.
    $form['#validate'] = is_array($form['#validate']) ? $form['#validate'] : array();
    // login using username or email address
    array_unshift($form['#validate'],'phponwebsites_user_login_validate');
  }
}

 /**
 * Implement phponwebsites_user_login_validate()
 *
 * Return name by its email address
 */
function phponwebsites_user_login_validate($form, &$form_state) {
  if (isset($form_state['values']['name']) && strpos($form_state['values']['name'], '@') !== false) {
      $name = db_query("SELECT name FROM {users} WHERE LOWER(mail) = LOWER(:name)", array(':name' => $form_state['values']['name']))->fetchField();
    }
  if (isset($name)) {
    form_set_value($form['name'], $name, $form_state);
  }
}

   Now you can login using both username and email. I've hope you know how to login using both username and email in Drupal 7.