查了一下 rfc 3986: 有下面一段
scheme names consist of a sequence of characters beginning with a letter and followed by any combination of letters, digits, plus ("+"), period ("."), or hyphen ("-").
rfc 2396 有下面的一段
the plus "+", dollar "$", and comma "," characters have been added to those in the "reserved" set, since they are treated as reserved within the query component.
表示加号已经是url的保留字了，不需要转义。
然后html4文档里才有关于加号的转义：
application/x-www-form-urlencoded
forms submitted with this content type must be encoded as follows:
control names and values are escaped. space characters are replaced by`+', and then reserved characters.....
声明只有content-type为application/x-www-form-urlencoded时才会对+做转义。
又翻了下php的文档，发现有一个
rawurlencode() - url-encode according to rfc 3986
也就是php又搞了rawurlencode和rawurldecode把标准实现了。。。。
不能反一下么，毕竟大部分人应该都会用urlencode。php真是蛋疼啊。。。。
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