{"id":48926,"date":"2017-07-17T14:09:50","date_gmt":"2017-07-17T08:39:50","guid":{"rendered":"http:\/\/www.tothenew.com\/blog\/?p=48926"},"modified":"2021-09-06T11:56:15","modified_gmt":"2021-09-06T06:26:15","slug":"drupal-8-frequently-used-services-functions-statements","status":"publish","type":"post","link":"https:\/\/www.tothenew.com\/blog\/drupal-8-frequently-used-services-functions-statements\/","title":{"rendered":"Drupal 8 Frequently Used Services, Functions, and Statements"},"content":{"rendered":"

In Drupal 8<\/a>, some important services, functions and statements are frequently used in all projects. These are time-saving statements and perform a very crucial operation. Drupal 8 have multiple statements that are very useful in the project and it is also essential for the performance & Drupal 8 standard.<\/p>\n

Drupal 8<\/strong> follow a PSR-4 standard, so Drupal 8 recommended the use of the PSR-4 standard code for the better performance. Drupal 8 provides a lot of services, statements & functions that are very prominent for a big project where performance is the priority<\/a>. We need these statements very frequently in Drupal 8 projects and we start searching on Google, which is a very time-consuming task and sometimes it is not possible when you are working offline.<\/p>\n

In Drupal 8 project, these statements\/services play very a vital role in performance, stability, and reusability because these are short line code and increases code reusability.<\/p>\n

In Drupal 8, a service is any object managed by the services container.<\/em>
\nDrupal 8 introduces a new concept of services to decouple reusability<\/a> and makes these services pluggable and replaceable by registering them with a service container. It’s a best practice to use these services provided by Drupal 8. The Symfony 2 documentation has a wide introduction to services.<\/em><\/p>\n

Following are frequently used statements, services and functions:<\/h2>\n

1. Drupal 8, How to get Node alias or Taxonomy Alias by Node id or Term ID?<\/strong><\/p>\n

[php]
\nuse Drupal\\Core\\Url;<\/p>\n

$options = array(‘absolute’ => true);
\n\/\/return node alias
\n$url = Url::fromRoute(‘entity.node.canonical’, [‘node’ => 1234], $options);<\/p>\n

\/\/return taxonomy alias
\n$url = Url::fromRoute(‘entity.taxonomy_term.canonical’, [‘taxonomy_term’ => 1234], $options);
\n[\/php]<\/p>\n

Sometimes we need a relative path and sometimes we need an absolute path. Drupal 8 has options parameters where you can pass true or false in an absolute key.<\/p>\n

Parameters description:<\/strong>
\n-absolute true will return absolute path.
\n-absolute false will return relative path.<\/p>\n

2. Drupal 8, How to get Node ID or Taxonomy term ID by Drupal alias or path?<\/strong><\/p>\n

[php]
\n$path = \\Drupal::service(‘path.alias_manager’)->getPathByAlias(‘\/alias-path’);
\nif(preg_match(‘\/node\\\/(\\d+)\/’, $path, $matches))
\n$nodeID = $matches[1];<\/p>\n

$path = \\Drupal::service(‘path.alias_manager’)->getPathByAlias(‘\/alias-path’);
\nif(preg_match(‘\/taxonomy\\\/term\\\/(\\d+)\/’, $path, $matches)) {$termID = $matches[1];}<\/p>\n

$path = \\Drupal::service(‘path.alias_manager’)->getPathByAlias(‘\/alias-path’);
\nif(preg_match(‘\/user\\\/(\\d+)\/’, $path, $matches)) {$userID = $matches[1];}
\n[\/php]<\/p>\n

If alias-path does not exist, it will return the same argument string.
\nThe first example will work for the node, the second for the taxonomy, and the third for the users.<\/p>\n

3. Drupal 8, How to get the object in the twig file?<\/strong>
\nIf you are looking to print how many objects have passed into twig file<\/a>, simply add a line in your .twig file.<\/p>\n

[php]
\n{{ kint() }}
\n[\/php]<\/p>\n

4. How to get the current Path in Drupal 8?<\/strong><\/p>\n

[php]
\n$currentPath = \\Drupal::service(‘path.current’)->getPath();
\n[\/php]<\/p>\n

It will return the current path in Drupal 8. For the node pages it return node\/{node id},for taxonomy taxonomy\/term\/{term id}, for user user\/{user id) if exists otherwise it will return the current request URI.<\/p>\n

5. How to get Affected rows by Delete or Update statement in Drupal 8?<\/strong><\/p>\n

[php]
\n$query = “Delete FROM table_name where id=10 “;
\n$affectedRows = $this->database->query($query,[],array(‘return’ => Database::RETURN_AFFECTED));<\/p>\n

$query = “Update table_name set couln_name=value where id=10 “;
\n$affectedRows = $this->database->query($query,[],array(‘return’ => Database::RETURN_AFFECTED));
\n[\/php]<\/p>\n

The above statements will return the number of rows affected by the SQL statement.<\/p>\n

6. How to check whether a module is installed or not in Drupal 8?<\/strong><\/p>\n

[php]
\n$moduleHandler = \\Drupal::service(‘module_handler’);
\nif ($moduleHandler->moduleExists(‘module_name’)){
\n\/\/echo “module installed”;} else {\/\/echo “module does not installed”;}
\n[\/php]<\/p>\n

7. How to get Route name in Drupal 8?<\/strong><\/p>\n

[php]
\n$route = \\Drupal::routeMatch()->getRouteName();
\n[\/php]<\/p>\n

The above statement will return the Drupal route. It returns an entity.node.canonical for the nodes, system.404 for the 404 pages, entity.taxonomy_term.canonical for the taxonomy pages, entity.user.canonical for the users, and custom route name that we define in modulename.routing.yml file.<\/p>\n

8. How to get the current page title in Drupal 8?<\/strong><\/p>\n

[php]
\n$request = \\Drupal::request();
\nif ($route = $request->attributes->get(\\Symfony\\Cmf\\Component\\Routing\\RouteObjectInterface::ROUTE_OBJECT)) {
\n$title = \\Drupal::service(‘title_resolver’)->getTitle($request, $route);}
\n[\/php]<\/p>\n

The above statement will return the current page title. If you use the above statement in the controller, it will also return the page title.<\/p>\n

9. How to get the current Document root path in Drupal 8?<\/strong><\/p>\n

[php]
\n$image_path = \\Drupal::service(‘file_system’)->realpath();
\n[\/php]<\/p>\n

The above statement will return the current document root path like \/var\/www\/html\/project1<\/em>.<\/p>\n

10. How to check the Frontpage in Drupal 8?<\/strong><\/p>\n

[php]
\n$is_front = \\Drupal::service(‘path.matcher’)->isFrontPage();
\n[\/php]<\/p>\n

The above statement will return either\u00a0true or false<\/em>. Return True for the Frontpage otherwise false.<\/p>\n

11. How to uncache a particular page in Drupal 8?<\/strong><\/p>\n

[php]
\n\\Drupal::service(‘page_cache_kill_switch’)->trigger();
\n[\/php]<\/p>\n

The above statement doesn’t keep the page in cache. You can use this statement in node_preprocess, controller, etc. with the condition. When this line is executed, the page will not go into the Drupal cache.<\/p>\n

12. How to redirect third-party URL in Drupal 8?<\/strong><\/p>\n

[php]
\n$response = new \\Drupal\\Core\\Routing\\TrustedRedirectResponse($absolute_url, 300);
\n;”>$response->send();
\nexit(0);
\n[\/php]<\/p>\n

The above statement will redirect on the third-party website with Redirect permanent status. The URL must have an absolute path like http:\/\/www.tothenew.com<\/em><\/p>\n

All the above statements are helpful in Drupal 8, so you should bookmark this blog page to speed up the project development, maintain the Drupal 8 standard and performance that is the key requirement for any Drupal website.<\/p>\n","protected":false},"excerpt":{"rendered":"

In Drupal 8, some important services, functions and statements are frequently used in all projects. These are time-saving statements and perform a very crucial operation. Drupal 8 have multiple statements that are very useful in the project and it is also essential for the performance & Drupal 8 standard. Drupal 8 follow a PSR-4 standard, […]<\/p>\n","protected":false},"author":1038,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":6},"categories":[3602,1],"tags":[3601,3604,3603,4638,4405],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/48926"}],"collection":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/users\/1038"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/comments?post=48926"}],"version-history":[{"count":2,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/48926\/revisions"}],"predecessor-version":[{"id":53897,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/48926\/revisions\/53897"}],"wp:attachment":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/media?parent=48926"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/categories?post=48926"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/tags?post=48926"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}