Add Membership to Woo Customer (For WooCommerce Memberships)

add_membership.php

<?php
//remove the following code after membership is added
add_action( 'init', 'myprefix_add_membership');
function myprefix_add_membership() {
    $customers = get_users('role=customer');
    $plan_id = 21356;//一般會員
    foreach( $customers as $customer ):
        $normal_membership = wc_memberships_get_user_membership( $customer->id, 'normal');
        if ($normal_membership) {
            continue;
        }

        $args = array(
            'user_id' => $customer->id,
            'plan_id' => $plan_id,
        );
        wc_memberships_create_user_membership( $args );
        
    endforeach;
}