Use delete_user_meta - wordpress

Question

I want to delete my usermeta in table database but give nothing. it give me an error because its not array expected string parameter
function remove_meta(){
$role = 'client'; //Select user role
$users = get_users('role='.$role);
global $wpdb;
$stats = $wpdb->get_results("
SELECT ".$wpdb->prefix." group_clients.client_id
FROM ".$wpdb->prefix." group_clients
WHERE ".$wpdb->prefix." group_clients.group_id IN (1, 2, 5, 6)
", $users); // Fetch data by selective group ID
$stats = array();
if (is_array($stats) || is_object($stats)){
//foreach ((array) $stats as $stat){
foreach ($stats as $stat) {
delete_user_meta($stat->ID, 'terms_and_conditions');
}
echo 'Fini!';
}
}

Answer 1

Try below code you are doing confusing code. Do not do sql query unless it is really required.
$args = array(
'role' => 'customer', //client or whatever you required
);
//geting all user
$users = get_users( $args );
foreach ($users as $result)
{
//each user id
$userId = $result->ID;
if($userId != '')
{
//getting all user meta of particular user
$all_meta_for_user = get_user_meta( $userId );
if(is_array($all_meta_for_user))
{
foreach ($all_meta_for_user as $key => $value) {
$terms =get_user_meta($userid,'terms_and_conditions',true);
if($terms !=''){
delete_user_meta($userId, 'terms_and_conditions');
}
}
}
}
}
with hook
add_action('init','deletedata');
function deletedata()
{
if(!is_admin())
return;
if(!current_user_can('manage_options'))
return false;
$args = array(
'role' => 'customer', //client or whatever you required
);
//geting all user
$users = get_users( $args );
foreach ($users as $result)
{
//each user id
$userId = $result->ID;
if($userId != '')
{
//getting all user meta of particular user
$all_meta_for_user = get_user_meta( $userId );
if(is_array($all_meta_for_user))
{
foreach ($all_meta_for_user as $key => $value) {
# code...
$terms =get_user_meta($userid,'terms_and_conditions',true);
if($terms !=''){
delete_user_meta($userId, 'terms_and_conditions');
}
}
}
}
}
}