Example 1, with FieldPluginBase (\Drupal\views\Plugin\views\field\FieldPluginBase)
public function render(ResultRow $values) {
$url = $this->getValue($values); //$url is an external image like : "https://www.drupal.org/files/druplicon.png";
$output[] = array(
'#theme' => 'imagecache_external',
'#uri' => $url,
'#style_name' => 'thumbnail',
'#alt' => 'Test alt',
'#title' => 'Test title',
'#width' => NULL,
'#height' => NULL,
'#attributes' => array(),
);
$renderer = $this->getRenderer();
return $renderer->render($output);
}
Example 2: Internal / External image from URL or URI
$output[] = [
'#theme' => 'image_style',
'#style_name' => 'thumbnail',
'#uri' => 'public://my-image.png',
// optional parameters
];
$output[] = [
'#theme' => 'image_style',
'#style_name' => 'thumbnail',
'#url' => 'https://mysite.com/my-image.png',
// optional parameters
];
$output[] = [
'#theme' => 'image',
'#uri' => 'public://my-image.png',
];
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