PHP urlencode () function-URL encoding conversion

 Understand urlencode:
Urlencode: a pointer to the Chinese characters in the URL of a Web page. The most common method is to enter Chinese Characters in search engines such as Baidu and Google, generate a webpage URL that has passed the encode. Urlencode has two methods: the traditional gb2312-based encode (Baidu, yisou, etc.), and the UTF-8-based encode (Google, Yahoo, etc ). This tool implements encode and decode in two ways respectively.

Chinese-> gb2312 encode-> % D6 % D0 % Ce % c4
English-> UTF-8 encode-> % E4 % B8 % ad % E6 % 96% 87

Urlencode in HTML:
In an HTML file encoded as gb2312,
Http://www.sendnet.cn/rar .rar-> browser automatically converted to-> http://www.sendnet.cn/%D6%D0%CE%C4.rar
Note: Firefox does not support the Chinese URL of gb2312 encode, because it is the UTF-8 code by default to send the URL, but ftp: // protocol can, I tried. I think this is a Firefox bug.

In an HTML file encoded as a UTF-8,
Http://www.sendnet.cn/rar .rar-> browser automatically converted to-> http://www.sendnet.cn//%E4%B8%AD%E6%96%87.rar

Urlencode in PHP:

// Gb2312 encode
Echo urlencode ("Chinese-_."). "\ n"; // % D6 % D0 % Ce % c4-_. +
Echo urldecode ("% D6 % D0 % Ce % c4-_."). "\ n"; // Chinese -_.
Echo rawurlencode ("Chinese-_."). "\ n"; // % D6 % D0 % Ce % c4-_. % 20
Echo rawurldecode ("% D6 % D0 % Ce % c4-_."). "\ n"; // Chinese -_.
?>

All non-alphanumeric characters except-_. will be replaced with a semicolon (%) followed by two hexadecimal numbers.
The difference between urlencode and rawurlencode:
Urlencode encodes a space into a plus sign (+)
Rawurlencode encodes a space into a plus sign (% 20)

If you want to use the UTF-8's encode, there are two ways:
1. Save the file as a UTF-8 file, directly use urlencode, rawurlencode.
2. Use the mb_convert_encoding function.

$ Url = 'HTTP: // www.sendnet.cn/ .rar ';
Echo urlencode (mb_convert_encoding ($ URL, 'utf-8', 'gb2312 '). "\ n ";
Echo rawurlencode (mb_convert_encoding ($ URL, 'utf-8', 'gb2312 '). "\ n ";
// Http%3a%2f%2fwww.sendnet.cn%2f%e4%b8%ad%e6%96%87.rar
?>

Instance:

Function parseurl ($ url = "")
{
$ Url = rawurlencode (mb_convert_encoding ($ URL, 'gb2312', 'utf-8 '));
$ A = array ("% 3A", "% 2f", "% 40 ");
$ B = array (":","/","@");
$ Url = str_replace ($ A, $ B, $ URL );
Return $ URL;
}
$ Url = "ftp: // sendnet: password@ftp.sendnet.cn/Chinese/ .rar ";
Echo parseurl ($ URL );
// Ftp: // sendnet: password@ftp.sendnet.cn/% D6 % D0 % Ce % c4/127d6%d0%ce%c4.rar
?>

Urlencode in javascript:

% E4 % B8 % ad % E6 % 96% 87-_. % 20% E4 % B8 % ad % E6 % 96% 87-_. % 20

Encodeuri does not encode the following characters: ":", "/", ";", "?" And.

Http://www.sendnet.cn/%E4%B8%AD%E6%96%87.rar
Http%3a%2f%2fwww.sendnet.cn%2f%e4%b8%ad%e6%96%87.rar

Online urlencode tool:

Http://tool.chinaz.com/Tools/URLEncode.aspx