Uppercase the first character of each word in the title attribute

uppercase_words_title.php

<?php

function string_uppercase_title( $attributes, $feed_id, $product_id ) {
  
	// this line changes the title data and removes the " <prompt> " string
	$attributes['title'] = ucwords(strtolower($attributes['title']));
	
	// IMPORTANT! Always return the $attributes
	return $attributes;
}

add_filter( 'wppfm_feed_item_value', 'string_uppercase_title', 10, 3 );