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On . By CodimTh

in this article, I'll show you how to check if a user email already exists in Drupal 8.

juste add ->condition('mail', '') in your query.

$ids = \Drupal::entityQuery('user')
  ->condition('mail', '')



 * Implements hook_preprocess_block().
function mytheme_preprocess_page(&$variables)

  $ids = \Drupal::entityQuery('user')
    ->condition('mail', '')

  if (!empty($ids)) {
    kint("this mail already exists");
  } else {
    kint("this mail not exists");
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