gistfile1.php

<?

function print_if($string, $condition = null)
{
	if (is_null($condition))
	{
		if (is_null($string) || empty($string))
		{
			return '';
		}
		
		if ($string === "0")
		{
			return "0";
		}
		
		if ($string === 0)
		{
			return 0;
		}
		
		return $string;
	}

	else if ($condition === TRUE)
	{
		return $string;
	}
	
	else
	{
		return '';
	}
}