woocommerce_variation_is_active │ filter-hook │ WC 1.0

Controls whether this particular variation will appear greyed-out (inactive) or not (active). Used by extensions to make incompatible variations appear greyed-out, etc. Other possible uses: prevent out-of-stock variations from being selected.

Usage

add_filter( 'woocommerce_variation_is_active', 'wp_kama_woocommerce_variation_is_active_filter', 10, 2 );

/**
 * Function for `woocommerce_variation_is_active` filter-hook.
 * 
 * @param  $true 
 * @param  $that 
 *
 * @return 
 */
function wp_kama_woocommerce_variation_is_active_filter( $true, $that ){

	// filter...
	return $true;
}

$true

-

$that

-

Where the hook is called

return apply_filters( 'woocommerce_variation_is_active', true, $this );

Where the hook is used in WooCommerce