learndash_billing_cycle_field_frequency_validate

learndash_billing_cycle_field_frequency_validate( string $price_billing_t3 )

Validate the billing cycle field frequency.

Description #

$price_billing_t3: (string) (Required) Billing frequency code. D, W, M, or Y.

(string) Valid frequency or empty string.

Changelog
Version	Description
3.5.0	Introduced.

Used By
Used By	Description
includes/settings/settings-billing-functions.php: learndash_billing_cycle_field_interval_validate ()	Validate the Billing cycle field interval.
includes/settings/settings-metaboxes/class-ld-settings-metabox-group-access-settings.php: LearnDash_Settings_Metabox_Group_Access_Settings::filter_saved_fields ()	Filter settings values for metabox before save to database.
includes/settings/settings-functions.php: learndash_get_setting ()	Gets the LearnDash setting for a post.
includes/class-ld-lms.php: SFWD_LMS::learndash_course_price_billing_cycle_save ()	Updates course price billy cycle on save Fires on action ‘save_post’
includes/settings/settings-metaboxes/class-ld-settings-metabox-course-access-settings.php: LearnDash_Settings_Metabox_Course_Access_Settings::filter_saved_fields ()	Filter settings values for metabox before save to database.