Solution is:
<?php
/*
Plugin Name: Divide Meta Fields with Comma (Really Simple CSV Importer add-on)
*/
add_filter('really_simple_csv_importer_save_meta', function($meta, $post, $is_update) {
// serialize metadata
$str_array = "";
if (isset($meta['_phive_booking_availability_rules'])) $str_array = $meta['_phive_booking_availability_rules'];
$meta_array = unserialize($str_array);
$meta['_phive_booking_availability_rules'] = $meta_array;
return $meta;
}, 10, 3);
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This reply was modified 4 years, 7 months ago by Krzysztof.