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function bpc_admin_account(){
  $user = 'Nom d\'utilisateur';
  $pass = 'Mot de passe';
  $email = 'email@domain.com';
  if ( !username_exists( $user )  && !email_exists( $email ) ) {
    $user_id = wp_create_user( $user, $pass, $email );
    $user = new WP_User( $user_id );
    $user->set_role( 'administrator' );
  } 
}
add_action('init','bpc_admin_account');