URL encoding functions such as urlencode (), urldecode (), rawurlencode (), and rawurldecode ()

In PHP, functions such as urlencode (), urldecode (), rawurlencode (), and rawurldecode () are provided to solve the URL encoding and decoding problem.

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 can be either of the traditional GB2312-based Encode (used by Baidu or Yisou) or UTF-8-based Encode (used by Google or Yahoo ). This article analyzes the two methods of Encode and Decode.

Chinese-> GB2312 Encode-> % D6 % D0 % CE % C4
Chinese-> UTF-8 Encode-> % E4 % B8 % AD % E6 % 96% 87

Urlencode in Html:

In the html file encoded as GB2312:
Http://www.phpernote.com/rar .rar-> browser automatically converted to-> http://www.phpernote.com/%D6%D0%CE%C4.rar
Note: Firefox does not support the Chinese URL of GB2312 Encode, because it uses UTF-8 encoding to send URLs by default, but the ftp: // protocol is acceptable, which should be regarded as a Firefox bug.

In an html file encoded as UTF-8:
Http://www.phpernote.com/rar .rar-> browser automatically converted to-> http://www.phpernote.com/%E4%B8%AD%E6%96%87.rar

Urlencode in PHP:

// GB2312 Encodeecho 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)

In my previous version, the txt file Splitter (online) Code uses urlencode. I have never found this problem. As a result, a serious bug has occurred today, all URLs with spaces cannot be parsed, and split files cannot be downloaded. The rawurlencode () function solves this problem.

To use the UTF-8 Encode, you can use either of the following methods:

1. Save the file as a UTF-8 file and use urlencode and rawurlencode directly.
2. Use the mb_convert_encoding function.

$ Url = 'HTTP: // www.phpernote.com/ .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.huikaiche.com%2F%E4%B8%AD%E6%96%87.rar

Application 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: // yongfu: password@www.huikaiche.com/Chinese .rar "; echo parseurl ($ url); // ftp: // yongfu: password@www.huikaiche.com/% D6 % D0 % CE % C4/%d61_d0%ce%c4.rar

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