I have found !
function register_accueilli($post_id) {
$action = $_POST['action_form'];
if ( $action == "inscription_accueilli" ) {
$f = $_POST['acf'];
$prenom = $f['field_580dda605ce41'];
$nom = $f['field_580dda605cdc8'];
$email = $f['field_580f277e392bc'];
$pseudo = sanitize_title($prenom." ".$nom);
if ( !username_exists($pseudo) && !email_exists($email) ) {
$random_password = wp_generate_password( $length = 8, false );
$key_active = wp_generate_password( $length = 20, false );
$user_id = wp_create_user( $pseudo, $random_password, $email );
$user_id_role = new WP_User($user_id);
$user_id_role->set_role('accueilli');
update_user_meta($user_id, 'pseudo', $pseudo );
update_user_meta($user_id, 'key_new', $key_active );
$test_inscription = wp_update_user( array(
'ID' => $user_id,
'first_name' => $prenom,
'last_name' => $nom,
'user_login' => $pseudo,
'user_nicename' => $prenom . " " . $nom,
'display_name' => $prenom . " " . $nom
));
$values_emails = array(
'prenom' => $prenom,
'nom' => $nom,
'pseudo' => $pseudo,
'mdp' => $random_password,
'url_activer' => get_bloginfo('url')."/inscription/activer-votre-compte/?key=".$key_active
);
envoyer_mail($email,232, $values_emails);
/* ------ ADD THE DO_ACTION SAVE POST ------ */
do_action('acf/save_post', "user_".$user_id);
}
}
}
add_filter('acf/pre_save_post' , 'register_accueilli' );