Cater for field type `flexible_content`

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The flexible_content field type is similar to the repeater field type.

You need to define one or more layouts in order for the Add Row button to display the layout type you want to add.

The field_info structure contains layouts which is a multi-dimensional associative array of layout arrays which contain an array of sub_fields within the layout.

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Example with one layout labelled Layout 1 (layout_1) that contains a text field called flexible_content_text.

 [layouts] => Array

        [layout_64896c6264a66] => Array

            [key] => (string) "layout_64896c6264a66"
            [name] => (string) "layout_1"
            [label] => (string) "Layout 1"
            [display] => (string) "row"
            [sub_fields] => Array

                [0] => Array

                    [ID] => (integer) 420
                    [key] => (string) "field_64896c7faa275"
                    [label] => (string) "Flexible Content Text"
                    [name] => (string) "flexible_content_text"
                    [aria-label] => (string) ""
                    [prefix] => (string) "acf"
                    [type] => (string) "text"
                    [value] => (NULL) 
                    [menu_order] => (integer) 0
                    [instructions] => (string) ""
                    [required] => (integer) 0
                    [id] => (string) ""
                    [class] => (string) ""
                    [conditional_logic] => (integer) 0
                    [parent] => (integer) 419
                    [wrapper] => *RECURSION* wrapper 0
                    [parent_layout] => (string) "layout_64896c6264a66"
                    [default_value] => (string) "FCT"
                    [maxlength] => (string) ""
                    [placeholder] => (string) ""
                    [prepend] => (string) ""
                    [append] => (string) ""
                    [_name] => (string) "flexible_content_text"
                    [_valid] => (integer) 1

            [min] => (string) ""
            [max] => (string) ""

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The value of $field is an array of the sections. The first item in each section is the name of the layout to use to display the section acf_fc_layout. The subsequent items are the values of the fields in that section/layout.

Array

    [0] => Array

        [acf_fc_layout] => (string) "layout_1"
        [flexible_content_text] => (string) "FCT 1"

    [1] => Array

        [acf_fc_layout] => (string) "layout_1"
        [flexible_content_text] => (string) "FCT 2"

In the prototype for this block's output we'll render each section as a div with a classname of the selected layout ( acf_fc_layout ) then render each of the sub_fields in the layout, obtaining the values for the field from the section's array.