Get the type of an advanced custom field (ACF) in a WP_Query loop [closed]

Question

The first version of my answer was that in general you would have to code that information yourself into the meta key itself. For example:

booking_date
booking_text
booking_number

But then I noticed the ACF tag of your question.

If you have a custom field key price, then it’s ACF field key is saved to the hidden _price custom field. For example as field_4fea85f5320da.

Then you can use

get_field_object( $field_key, $post_id, $options )

to retrieve all the ACF information related to the custom field:

Array
(
    [key] => field_4fea85f5320da
    [label] => Text Field
    [name] => text_field
    [type] => text
    [instructions] => 
    [required] => 0
    [default_value] => 
    [formatting] => html
    [order_no] => 0
    [value] => Use the option parameter to toggle loading the value
)

Check the ACF documentation on get_field_object here.

You could for example try to fetch it with:

$field_key = get_post_meta( '_price', TRUE );
if( ! empty( $field_key ) )
{
    $data = get_field_object( $field_key, $post_id );
    if( isset( $data['type'] ) )
        $type = $data['type'];
}