人民网

NCR转字符串的方法：

echo mb_convert_encoding ("人民网", "GBK", "HTML-ENTITIES");

纯函数转换的方法：

<?php
$str = '&#20154;&#27665;&#32593;';
echo convert_unicode($str);

function u2utf8($c) {
	$str='';
	if ($c < 0x80) {
		$str.=$c;
	} else if ($c < 0x800) {
		$str.=chr(0xC0 | $c>>6);
		$str.=chr(0x80 | $c & 0x3F);
	} else if ($c < 0x10000) {
		$str.=chr(0xE0 | $c>>12);
		$str.=chr(0x80 | $c>>6 & 0x3F);
			$str.=chr(0x80 | $c & 0x3F);
	} else if ($c < 0x200000) {
		$str.=chr(0xF0 | $c>>18);
		$str.=chr(0x80 | $c>>12 & 0x3F);
		$str.=chr(0x80 | $c>>6 & 0x3F);
		$str.=chr(0x80 | $c & 0x3F);
	}
	return $str;
}

function convert_unicode($source)
{
	preg_match_all("/&#([0-9]+)/",$source, $regs);
	foreach($regs[1] as $v)
	{
		$source = str_replace("&#".$v.";",u2utf8($v),$source);
	}
	return $source;
}

• http://en.wikipedia.org/wiki/Numeric_character_reference