Changes uppercase sequences to lowercase and wraps in a span with the "text-transform:uppercase" style. This is helpful to lower your spam rating on email newsletters. Most spam filters don't like seeing ALL CAPS, because it's usually IS spam..

uppercaseToCss

<?php
  function replaceUpperCaseWithCss($matches){
		$lower = strtolower($matches[0]);
		return sprintf('<span style="text-transform:uppercase;">%s</span>', $lower);
	}

	function findUpperCaseSequences($text){
		return preg_replace_callback("/[^a-z\ ]{2,}(\ [^a-z\ ]+)*\b/", "replaceUpperCaseWithCss", $text);
	}

	$string = "I CAN! DO mutliple WO-RDS, but I ignore WORDS with One Capital Letter";
	echo findUpperCaseSequences($string);