Link to other page in Drupal 8 - php

Question

In Drupal 7, I used following codes to link to other pages. I have "Service" block and inside that block , I write like this.
<?php
global $base_url;
global $base_path;
$link = $base_url . '/sites/all/themes/bootstrap_business/images';
?>
<div><img alt="" src="<?php print $link?>/customer.png" /></div>
<p> Service</p>
and I save text format with PHP.
But for now Drupal 8, we don't have Text format option "PHP" and also I don't know how to write codes to connect with other page.
Anyone help me please? Thanks.

Answer 1

In drupal 8 you can use hook_preprocess_HOOK() to pass variables to twig files and call your variables like
<header class="main-header">
{{ title_prefix }}
{% if page.header and logged_in %}
{{ page.header }}
{% endif %}
{% if not logged_in %}
<a href="{{ front_page }}" title="{{ 'Home'|t }}" rel="home" id="logo" class="logo">
<img src="{{ base_path }}themes/custom/mytheme/logo-login.png" alt="{{ 'Home'|t }}" />
</a>
<h2 class="login-logo">{{ site_name }}</h2>
{% endif %}
{{ title_suffix }}
</header>
Please see https://www.drupal.org/docs/8/theming/twig/functions-in-twig-templates for more details
You can also include other pages using
{# this template is located in templates/layout.html.twig #}
{% extends "layout.html.twig" %}
{# this template is located in templates/user/profile.html.twig #}
{{ include('user/profile.html.twig') }}

Answer 2

See: https://www.drupal.org/docs/8/theming/twig/functions-in-twig-templates
In your example, you need to specify your theme directory. Just use:
<img src="/{{ directory }}/images/xyz.jpg">
Here, {{directory }} will resolve to directory of your current theme.
For preparing links to other fields. see above mentioned drupal page