php中urlencode与rawurlencode的区别有那些呢
urlencode 函数:
返回字符串,此字符串中除了 -_. 之外的所有非字母数字字符都将被替换成百分号(%)后跟两位十六进制数,空格则编码为加号(+)。此编码与 WWW 表单 POST 数据的编码方式是一样的,同时与 application/x-www-form-urlencoded 的媒体类型编码方式一样。由于历史原因,此编码在将空格编码为加号(+)方面与 RFC1738 编码(参见 rawurlencode())不同。
rawurlencode 函数:
返回字符串,此字符串中除了 -_. 之外的所有非字母数字字符都将被替换成百分号(%)后跟两位十六进制数。这是在 » RFC 3986 中描述的编码,是为了保护原义字符以免其被解释为特殊的 URL 定界符,同时保护 URL 格式以免其被传输媒体(像一些邮件系统)使用字符转换时弄乱。下面我们来看一下例子:
<?php
$string = "hello world";
echo urlencode($string) . '<br/>'; //输出:hello+world
echo rawurldecode($string) . '<br/>';//输出:hello%20world
?>
具体例子比较:
<?php
for ($i = 0x20; $i < 0x7f; $i++) {
$str .= dechex($i);
}
$asscii = pack("H*",$str);
echo "所有的可打印的asscii字符:(从空格到~)n". $asscii."\n";
echo "urlencode 的结果:\n".urlencode($asscii);
echo "\n";
echo "urlencode 不做编码的字http://www.jb51.net/符:\n".preg_replace("/%.{2}/","",urlencode($asscii));
echo "\n";
echo "rawurlencode 的结果:\n".rawurlencode($asscii);
echo "\n";
echo "rawurlencode 不做编码的字符:\n".preg_replace("/%.{2}/","",rawurlencode($asscii));
echo "\n";
exit;
?>
输出结果:
―――――――――――――――――――――――――――
所有的可打印的asscii字符:(从空格到~)
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_abcdefghijklmnopqrstuvwxyz{|}~
urlencode 的结果:
+%21%22%23%24%25%26%27%28%29%2A%2B%2C-.%2F0123456789%3A%3B%3C%3D%3E%3F%40ABCDEFGHIJKLMNOPQRSTUVWXYZ%5B%5C%5D%5E_%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D%7E
urlencode 不做编码的字符:
+-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz
rawurlencode 的结果:
%20%21%22%23%24%25%26%27%28%29%2A%2B%2C-.%2F0123456789%3A%3B%3C%3D%3E%3F%40ABCDEFGHIJKLMNOPQRSTUVWXYZ%5B%5C%5D%5E_%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D%7E
rawurlencode 不做编码的字符:
-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz
比较二者的结果:
1. 数字、大小写字母都不编码
2. 减号、点号、下划线 三个不编码
3. rawurlencode比urlencode多编码一个”加号“
关于javascript中escape与encodeURIComponent的区别:
>>> console.log(encodeURIComponent("统一注册1"));
%E7%BB%9F%E4%B8%80%E6%B3%A8%E5%86%8C1
>>> console.log(escape("统一注册1"));
%u7EDF%u4E00%u6CE8%u518C1
<?php
echo iconv("utf-8","gbk",urldecode("%E7%BB%9F%E4%B8%80%E6%B3%A8%E5%86%8C1"));
echo "\n";
echo urldecode("%u7EDF%u4E00%u6CE8%u518C1");
// 使用下面的unescape可以
//echo iconv("utf-8","gbk",unescape("%u7EDF%u4E00%u6CE8%u518C1");
exit;
?>
输出结果:
======================================
统一注册1
%u7EDF%u4E00%u6CE8%u518C1
======================================
结果说明:
1. encodeURIComponent 总是把输入转换成utf8编码处理的,按字节编码
2. escape是按照unicode编码处理的,因为它也对url中不安全的字符做了编码,所以也可以在url中做编码使用,但是,服务器端不会自动解码,下面提供一个PHP版的解码函数,是用手册里找的:
<?php
function unescape($str) {
$str = rawurldecode($str);
preg_match_all("/(?:%u.{4})|&#x.{4};|&#d+;|.+/U",$str,$r);
$ar = $r[0];
foreach($ar as $k=>$v) {
if(substr($v,0,2) == "%u")
$ar[$k] = iconv("UCS-2","UTF-8",pack("H4",substr($v,-4)));
elseif(substr($v,0,3) == "&#x")
$ar[$k] = iconv("UCS-2","UTF-8",pack("H4",substr($v,3,-1)));
elseif(substr($v,0,2) == "&#") {
$ar[$k] = iconv("UCS-2","UTF-8",pack("n",substr($v,2,-1)));
}
}
return join("",$ar);
}
?>
>>> console.log(escape(" !\"#$%&'()*+,-./0123456789:;=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_abcdefghijklmnopqrstuvwxyz{|}~"));
%20%21%22%23%24%25%26%27%28%29*+%2C-./0123456789%3A%3B%3C%3D%3E%3F@ABCDEFGHIJKLMNOPQRSTUVWXYZ%5B%5D%5E_%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D%7E
>>> console.log(encodeURIComponent("!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_abcdefghijklmnopqrstuvwxyz{|}~"));
%20!%22%23%24%25%26'()*%2B%2C-.%2F0123456789%3A%3B%3C%3D%3E%3F%40ABCDEFGHIJKLMNOPQRSTUVWXYZ%5B%5D%5E_%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D~
>>> console.log(escape("!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_abcdefghijklmnopqrstuvwxyz{|}~").replace(/%.{2}/g,""));
*+-./0123456789@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz
>>> console.log(encodeURIComponent("!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~").replace(/%.{2}/g,""));
!'()*-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~
结果比较:
escape未编码的字符: *+-./@_ 共7个
encodeURIComponent未编码的字符: !'()*-._~ 共9个