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Sanitize callback that treats data as HTML.
function x_custom_metadata_sanitize_as_html( $field_slug, $field, $object_type, $object_id, $value ) {
if ( is_array( $value ) )
$value = array_map( 'wp_filter_post_kses', $value );
$value = wp_filter_post_kses( $value );
return $value;
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