高亮XML代码的函数，CodeIgniter Helper

xml_highlight_helper.php

<?php

// 高亮XML代码
if ( ! function_exists('xml_highlight'))
{
  function xml_highlight($s)
	{        
		$s = htmlspecialchars($s);
		$s = preg_replace("#&lt;([/]*?)(.*)([\s]*?)&gt;#sU", "<span style=\"color:#0000FF\">&lt;\\1\\2\\3&gt;</span>",$s);
		$s = preg_replace("#&lt;([\?])(.*)([\?])&gt;#sU", "<span style=\"color:#800000\">&lt;\\1\\2\\3&gt;</span>",$s);
		$s = preg_replace("#&lt;([^\s\?/=])(.*)([\[\s/]|&gt;)#iU", "&lt;<span style=\"color:#808000\">\\1\\2</span>\\3",$s);
		$s = preg_replace("#&lt;([/])([^\s]*?)([\s\]]*?)&gt;#iU", "&lt;\\1<span style=\"color:#808000\">\\2</span>\\3&gt;",$s);
		$s = preg_replace("#([^\s]*?)\=(&quot;|')(.*)(&quot;|')#isU", "<span style=\"color:#800080\">\\1</span>=<span style=\"color:#FF00FF\">\\2\\3\\4</span>",$s);
		$s = preg_replace("#&lt;(.*)(\[)(.*)(\])&gt;#isU", "&lt;\\1<span style=\"color:#800080\">\\2\\3\\4</span>&gt;",$s);
		return str_replace("\n", '<br style="height:0" />', $s);
	}
}