Array Sanitization in WordPress

There are two type of array sanitization like single-level array and nested array.

Single-level array sanitization:

$attribute_display_type         = isset( $_POST['attribute_display_type'] ) ? array_map('sanitize_text_field', wp_unslash($_POST['attribute_display_type'])) : '';

Nested array sanitization:

$variation_meta_tooltip         = isset($_POST['variation_meta_tooltip']) ? map_deep(wp_unslash($_POST['variation_meta_tooltip']), 'sanitize_text_field') : [];