Detailed explanation of PHP functions: urlencode()-PHP Tutorial-php.cn

Detailed explanation of PHP functions: urlencode()

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Release： 2016-07-25 08:46:41

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The urlencode function URL-encodes the incoming string parameters. Except for "ˉ—.", all non-alphanumeric characters in the returned string are replaced with a percent sign (%) followed by two hexadecimal digits, and spaces are encoded as plus signs (+). This function facilitates encoding the string and using it in the request part of the URL, and also facilitates passing variables to the next page.

URLEncode: refers to an encoding conversion method for Chinese characters in web page URLs. The most common one is that when Chinese queries are entered in search engines such as Baidu and Google, an encoded web page URL is generated. There are generally two methods of URLEncoding. One is the traditional Encode based on GB2312 (used by Baidu, Yisou, etc.), and the other is based on UTF-8 Encode (used by Google, Yahoo, etc.). This tool implements two methods of Encode and Decode respectively.

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

Html

is encoded into the GB2312 html file, http://www.nowamagic.net/中文.rar -> The browser automatically converts it to -> http://www.nowamagic. net/%D6%D0%CE%C4.rar

Note: Firefox does not support the Chinese URL of GB2312 Encode because it defaults to UTF-8 encoding to send the URL, but the ftp:// protocol Can.

In the html file encoded as UTF-8, http://www.nowamagic.net/中文.rar -> The browser automatically converts to -> http://www.nowamagic.net/ %E4%B8%AD%E6%96%87.rar

URLEncode in PHP:

//Encode of GB2312
echo urlencode ("Chinese -_. ")."n"; //%D6%D0%CE%C4-_.+
echo urldecode("%D6%D0%CE%C4-_. ")."n"; // Chinese-_.
echo rawurlencode("中文-_. ")."n"; //%D6%D0%CE%C4-_.%20
echo rawurldecode("%D6%D0%CE%C4 -_. ")."n"; //Chinese-_.
?>

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All non-alphanumeric characters except -_. will be replaced with a percent sign (%) followed by two hexadecimal digits.

The difference between urlencode and rawurlencode:

urlencode encodes spaces as plus signs (+)
rawurlencode encodes spaces as plus signs (%20)

If you want to use UTF-8 Encode, there are two methods:

Save the file as a UTF-8 file, just use urlencode or rawurlencode directly.
Use the mb_convert_encoding function.

$url = 'http://www.nowamagic.net/中文.rar';
echo urlencode(mb_convert_encoding($url, 'utf-8', 'gb2312') )."n";
echo rawurlencode(mb_convert_encoding($url, 'utf-8', 'gb2312'))."n";
//http%3A%2F%2Fwww.nowamagic.net%2F% E4%B8%AD%E6%96%87.rar
?>

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Example:

function parseurl($url="")
{
$url = rawurlencode(mb_convert_encoding($url, 'gb2312', 'utf-8'));
$a = array("%3A", "%2F", "%40");
$b = array(":", "/", "@"); b, $url);
return $url;
}
$url="ftp://ud03:password@www.nowamagic.net/中文/中文.rar";
echo parseurl($url) ;
//ftp://ud03:password@www.nowamagic.net/%D6%D0%CE%C4/%D6%D0%CE%C4.rar
?>

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URLEncode in JavaScript: %E4%B8%AD%E6%96%87-_.%20%E4%B8%AD%E6%96%87-_.%20, encodeURI does not encode the following characters: Special characters such as ":", "/", ";", "?", and "@".