WordPress at a glance
filter is not described

woocommerce_save_account_details_required_fields filter-hook . WC 1.0

Handle required fields.

Usage

add_filter( 'woocommerce_save_account_details_required_fields', 'filter_function_name_5685' );
function filter_function_name_5685( $array ){
	// filter...

	return $array;
}
$array
-

Where the hook is called

WC_Form_Handler::save_account_details()
woocommerce_save_account_details_required_fields
woocommerce/includes/class-wc-form-handler.php 265-273
$required_fields = apply_filters(
	'woocommerce_save_account_details_required_fields',
	array(
		'account_first_name'   => __( 'First name', 'woocommerce' ),
		'account_last_name'    => __( 'Last name', 'woocommerce' ),
		'account_display_name' => __( 'Display name', 'woocommerce' ),
		'account_email'        => __( 'Email address', 'woocommerce' ),
	)
);

Where in WP core the hook is used WooCommerce

Usage not found.