Make title attribute lowercase

make-item-title-lower-case.php

/**
 * Alter Product feed item
 * Make the title attribute lowercase
 */
function alter_feed_item( $attributes, $feed_id, $product_id ) {
	
	// lowercase
  $title = $attributes['title'];
  $title = strtolower($title); //make lower case
  $title = ucfirst($title) // maken first character capitalized
	$attributes['title'] = $title;  

	// IMPORTANT! Always return the $attributes
	return $attributes;
}
add_filter( 'wppfm_feed_item_value', 'alter_feed_item', 10, 3 );