By: Prem Tiwari | Last Updated: | In: Drupal, Drupal Beginners
Are you a drupal developer then this tutorial is very useful for you. In this tutorial, You will find some extremely useful code snippets for your drupal 8 site. I have collected these all snippets from google and create a complete tutorial in one place for my site visitors. These snippets will help you to add some extra features in your drupal websites.
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< ? /** * Implements hook_menu(). */ function my_module_menu() { $items['admin/my-module'] = array( 'title' => 'My module admin page', 'page callback' => 'system_admin_menu_block_page', 'access arguments' => array('access administration pages'), 'file path' => drupal_get_path('module', 'system'), 'file' => 'system.admin.inc', ); $items['admin/my-module/settings'] = array( 'title' => 'Basic Settings', 'description' => 'My module Settings', 'page callback' => 'drupal_get_form', 'page arguments' => array('my_module_settings_form'), 'access arguments' => array('access my module settings page'), ); return $items; } |
Use below code to get custom user fields in drupal 8.
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function theme_preprocess_node(&$variables){ $node = $variables['node']; $variables['firstname'] = $node->getOwner()->field_first_name->value; $variables['lastname'] = $node->getOwner()->field_last_name->value; } |
Below function will calculate the difference between the current date and given date.
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function get_time_diff_in_minutes($time_given) { if ($time_given != '') { $time = time(); $current_time = date('Y-m-d H:i:s', $time); $current_time_object = new DateTime($current_time); $time_given_object = new DateTime($time_given); $interval = date_diff($current_time_object, $time_given_object); $minutes = $interval->days * 24 * 60; $minutes += $interval->h * 60; $minutes += $interval->i; return $minutes; } } |
Are you want to create a user account programmatically in drupal 8. Below drupal code will create a user account programmatically in your drupal 8. Copy below function and use it in your web page to create a user account in your drupal 8 websites.
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public function submitForm(array &$form, FormStateInterface $form_state) { $language = \Drupal::languageManager()->getCurrentLanguage()->getId(); $user = \Drupal\user\Entity\User::create(); $user->setPassword($form_state->getValue('pass')); $user->enforceIsNew(); $user->setEmail($form_state->getValue('mail')); $user->setUsername($form_state->getValue('name'));//This username must be unique and accept only a-Z,0-9, - _ @ . $user->set("init", 'mail'); $user->set("langcode", $language); $user->set("preferred_langcode", $language); $user->set("preferred_admin_langcode", $language); $user->activate(); //Save user account $user->save(); // No email verification required; log in user immediately. _user_mail_notify('register_no_approval_required', $user); user_login_finalize($user); drupal_set_message($this->t('Registration successful. You are now logged in.')); $form_state->setRedirect(''); } |
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//render a link $url = Url::fromRoute('modaltest.page'); $internal_link = \Drupal::l(t('Modal Page'), $url); // Other examples $internal_link = \Drupal::l(t('Modal Page'), Url::fromRoute('modaltest.page')); // Return an link. return array('#markup' => \Drupal::l(t('Modal Page'), Url::fromRoute('modaltest.page'))); |
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$permissions = \Drupal::service('user.permissions')->getPermissions(); print_r($permissions); |
Output will be:
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Array ( [administer blocks] => Array ( [title] => stdClass Object ( [__CLASS__] => Drupal\Core\StringTranslation\TranslatableMarkup [string] => Administer blocks [translatedMarkup] => [options] => Array ( ) [stringTranslation] => stdClass Object ( [__CLASS__] => Drupal\Core\StringTranslation\TranslationManager [translators] => Array ( [30] => Array ( [0] => Drupal\Core\StringTranslation\Translator\CustomStrings ) ) [sortedTranslators] => Array ( [0] => stdClass Object ( [__CLASS__] => Drupal\Core\StringTranslation\Translator\CustomStrings [settings] => Drupal\Core\Site\Settings [translations] => Array(1) ) ) [defaultLangcode] => en ) [arguments] => Array ( ) ) [description] => [provider] => block ) [export configuration] => Array ( [title] => stdClass Object ( [__CLASS__] => Drupal\Core\StringTranslation\TranslatableMarkup [string] => Export configuration [translatedMarkup] => [options] => Array ( ) [stringTranslation] => stdClass Object ( [__CLASS__] => Drupal\Core\StringTranslation\TranslationManager [translators] => Array ( [30] => Array ( [0] => Drupal\Core\StringTranslation\Translator\CustomStrings ) ) [sortedTranslators] => Array ( [0] => stdClass Object ( [__CLASS__] => Drupal\Core\StringTranslation\Translator\CustomStrings [settings] => Drupal\Core\Site\Settings [translations] => Array(1) ) ) [defaultLangcode] => en ) [arguments] => Array ( ) ) [restrict access] => 1 [description] => [provider] => config ) [import configuration] => Array ( [title] => stdClass Object ( [__CLASS__] => Drupal\Core\StringTranslation\TranslatableMarkup [string] => Import configuration [translatedMarkup] => [options] => Array ( ) [stringTranslation] => stdClass Object ( [__CLASS__] => Drupal\Core\StringTranslation\TranslationManager [translators] => Array ( [30] => Array ( [0] => Drupal\Core\StringTranslation\Translator\CustomStrings ) ) [sortedTranslators] => Array ( [0] => stdClass Object ( [__CLASS__] => Drupal\Core\StringTranslation\Translator\CustomStrings [settings] => Drupal\Core\Site\Settings [translations] => Array(1) ) ) [defaultLangcode] => en ) [arguments] => Array ( ) ) [restrict access] => 1 [description] => [provider] => config ) |
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/** * Implements hook_css_alter(); */ function MY_THEME_css_alter(&$css) { $remove = array( 'misc/vertical-tabs.css', 'misc/vertical-tabs-rtl.css', 'misc/ui/jquery.ui.core.css', 'misc/ui/jquery.ui.theme.css', 'modules/comment/comment.css', 'modules/comment/comment-rtl.css', 'modules/field/theme/field.css', 'modules/field/theme/field-rtl.css', 'modules/file/file.css', 'modules/filter/filter.css', 'modules/node/node.css', 'modules/search/search.css', 'modules/search/search-rtl.css', 'modules/system/system.admin.css', 'modules/system/system.admin-rtl.css', 'modules/system/system.base.css', 'modules/system/system.base-rtl.css', 'modules/system/system.maintenance.css', 'modules/system/system.menus.css', 'modules/system/system.menus-rtl.css', 'modules/system/system.messages.css', 'modules/system/system.messages-rtl.css', 'modules/system/system.theme.css', 'modules/system/system.theme-rtl.css', 'modules/user/user.css', 'modules/user/user-rtl.css', 'sites/all/modules/ctools/css/ctools.css', ); foreach ($remove as $value) { unset($css[$value]); } } |
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/** * Implements hook_file_insert(). */ function MYMODULE_file_insert($file) { $hash = 'public://' . md5($file->filename) . '.' . pathinfo($file->filename, PATHINFO_EXTENSION); file_move($file, $hash, 'FILE_EXIST_REPLACE'); } |
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$block_id = 1; $block = \Drupal::entityManager()->getStorage('block_content')->load($block_id); $block_view = \Drupal::entityManager()->getViewBuilder('block_content')->view($block); $variables['variable_name'] = $block_view; |
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namespace Drupal\example\Form; use Drupal\Core\Form\FormBase; class ExampleForm extends FormBase { /** * Implements \Drupal\Core\Form\FormBase::buildForm(). */ public function buildForm(array $form, array &$form_state) { // Define your form here, as usual. $form[’example_form_email'] = array( '#type' => ’email', '#title' => t(‘Please enter your email address.'), ); return $form; } /** * Implements \Drupal\Core\Form\FormBase::submitForm(). */ public function submitForm(array &$form, array &$form_state) { $example_email = $form_state['values']['example_form_email’]); config(‘example_form.email') ->set('example_email', $example_email) ->save(); } } |
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Prem Tiwari is the founder of FreeWebMentor.com and also a professional developer who has vast experience in PHP and open source technologies. Apart from this, he is a blogger by hobby and also he has been a regular speaker of WordPress sessions in various IT Companies. View all posts by Prem Tiwari
