<?php
	function function_output($price=0,$type='normal') {

    switch (true) {
      case $type == "special":
        $message = "It's Special";
        break;
      case $price == 0:
        $message = '<span class="free">Free</span>';
        break;
      default:
        $message = '$'.$price;
    }

    return $message;

}

echo function_output(50).PHP_EOL;
echo function_output(0).PHP_EOL;
echo function_output(500,'special');

?>