Repeat field and wp insert post

For multi-column repeat field, every row saves as a new meta field. Here’s the multicolumn code that the plugin uses:
[php]
// save any multicolumn repeatable fields
foreach ($multi_repeated as $repeat_key => $repeat_value) {
// first, delete any previous repeatable fields
delete_post_meta( $post_id, $repeat_key );

// now add them
foreach ($repeat_value as $repeat_field) {
add_post_meta( $post_id, $repeat_key, $repeat_field );
}
}
[/php]

For single column, it uses a separator (| – pipe) for every field and saves in a single meta key concatenated.