不灭的焱

<?
/**
 * 将字符串转换成unicode编码
 *
 * @param string $input
 * @param string $input_charset
 * @return string
 */
function str_to_unicode($input, $input_charset = 'gbk'){
	$input = iconv($input_charset, "gbk", $input);
	preg_match_all("/[x80-xff]?./", $input, $ar);
	$b = array_map('utf8_unicode_', $ar[0]);
	$outstr = join("", $b);

	return $outstr;
}

function utf8_unicode_($c, $input_charset = 'gbk') {
	$c = iconv($input_charset, 'utf-8', $c);
	return utf8_unicode($c);
}

// utf8 -> unicode
function utf8_unicode($c) {
	switch(strlen($c)) {
		case 1:
			return $c;
		case 2:
			$n = (ord($c[0]) & 0x3f) << 6;
			$n += ord($c[1]) & 0x3f;
		break;
		case 3:
			$n = (ord($c[0]) & 0x1f) << 12;
			$n += (ord($c[1]) & 0x3f) << 6;
			$n += ord($c[2]) & 0x3f;
		break;
		case 4:
			$n = (ord($c[0]) & 0x0f) << 18;
			$n += (ord($c[1]) & 0x3f) << 12;
			$n += (ord($c[2]) & 0x3f) << 6;
			$n += ord($c[3]) & 0x3f;
		break;
	}

	return "&#$n;";
}

/**
 * 将unicode字符转换成普通编码字符
 *
 * @param string $str
 * @param string $out_charset
 * @return string
 */
function str_from_unicode($str, $out_charset = 'gbk') {
	$str = preg_replace_callback("|&#([0-9]{1,5});|", 'unicode2utf8_', $str);
	$str = iconv("UTF-8", $out_charset, $str);
	return $str;
}

function unicode2utf8_($c) {
	return unicode2utf8($c[1]);
}
function unicode2utf8($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;
}

/**
 * 模拟JS里的unescape
 *
 * @param unknown_type $str
 * @return unknown
 */
function unescape($str) {
	$str = rawurldecode($str);
	preg_match_all("/(?:%u.{4})|.{4};|&#d+;|.+/U",$str,$r);
	$ar = $r[0];
	#print_r($ar);
	foreach($ar as $k=>$v) {
		if(substr($v,0,2) == "%u")
			$ar[$k] = iconv("UCS-2","GB2312",pack("H4",substr($v,-4)));
		elseif(substr($v,0,3) == "")
			$ar[$k] = iconv("UCS-2","GB2312",pack("H4",substr($v,3,-1)));
		elseif(substr($v,0,2) == "&#") {
			echo substr($v,2,-1)."";
			$ar[$k] = iconv("UCS-2","GB2312",pack("n",substr($v,2,-1)));
		}
	}
	return join("",$ar);
}
?>

根据上面提供的资料，项目中实战如下：

前端用JS函数 “ encodeURIComponent ” 编码，服务端用下面这个自定义PHP函数解码：

/** 模拟JS里的unescape
 *
 * @param unknown_type $str
 */
function unescape($str, $charset = 'utf-8') {
	$str = rawurldecode($str);
	preg_match_all("/(?:%u.{4})|.{4};|&#d+;|.+/U", $str, $r);
	$ar = $r[0];
	foreach ($ar as $k => $v) {
		if (substr($v,0,2) == "%u")
			$ar[$k] = iconv("UCS-2", $charset, pack("H4",substr($v,-4)));
		elseif (substr($v, 0, 3) == "")
			$ar[$k] = iconv("UCS-2", $charset, pack("H4", substr($v, 3, -1)));
		elseif (substr($v,0,2) == "&#") {
			echo substr($v,2,-1) . "";
			$ar[$k] = iconv("UCS-2", $charset, pack("n", substr($v, 2, -1)));
		}
	}

	return join("", $ar);
}

服务端解码：

$firstName = urldecode(trim($POST('firstName')));
$firstName  = unescape($firstName);