Here is a detailed explanation:///\\\
String UrlEncode (String str)
Returns a string, in addition to-_, in this string. All non-alphanumeric characters are replaced with a percent sign (%) followed by a two-digit hexadecimal number, and a space is encoded as a plus (+). This encoding is the same as the WWW form POST data, and is encoded in the same way as the application/x-www-form-urlencoded media type. For historical reasons, this encoding differs from RFC1738 encoding (see Rawurlencode ()) in terms of encoding spaces as plus signs (+). This function makes it easy to encode a string and use it for the request part of the URL, and it also facilitates passing the variable to the next page: Example 1. UrlEncode () example
Copy CodeThe code is as follows:
Echo ';
?>
Note: Be careful with variables that match the HTML entity. such as &, ©, and £ will be parsed by the browser and replaced with the actual entity with the expected variable name. This is a clear confusion, and the crowd has been telling people for years. Reference address: http://www.w3.org/TR/html4/appendix/notes.html#h-B.2.2 PHP supports the use of the Arg_separator. INI directive to turn the parameter delimiter into a semicolon recommended by the consortium. Unfortunately, most user agents do not send form data in a semicolon-delimited format. A simpler solution is to use & instead of & As a delimiter. You don't need to modify PHP's arg_separator for this. Make it still &, and use only Htmlentities (UrlEncode ($data)) to encode your URL.
Example 2. UrlEncode () and htmlentities () example
Copy CodeThe code is as follows:
Echo ';
?>
String UrlEncode (String str)
Returns a string, in addition to-_, in this string. All non-alphanumeric characters are replaced with a percent (%) followed by a two-digit hexadecimal number. This is the encoding described in RFC 1738 to protect the literal characters from being interpreted as a special URL delimiter, while protecting the URL format from being confused by the transfer of media (like some messaging systems) using character conversions. For example, if you want to include a password in the FTP URL:
Example 1. Rawurlencode () Example 1
Copy CodeThe code is as follows:
Echo ' @ftp. My.com/x.txt ' > ';
?>
Or, if you want to pass the message through the Path_info component of the URL:
Example 2. Rawurlencode () Example 2
Copy CodeThe code is as follows:
Echo ' Rawurlencode (' Sales and Marketing/miami '), ' > ';
?>
When decoding, you can use the corresponding UrlDecode () and Rawurldecode (), accordingly, Rawurldecode () will not decode the plus sign (' + ') to a space, and UrlDecode () can. Here is a detailed example:
String UrlDecode (String str)
Decodes any%## in the encoded string given. Returns the decoded string. Example 1. UrlDecode () example
Copy CodeThe code is as follows:
$a = Explode (' & ', $QUERY _string);
$i = 0;
while ($i < count ($a)) {
$b = Split (' = ', $a [$i]);
Echo ' Value for parameter ', Htmlspecialchars (UrlDecode ($b [0])),
' Is ', Htmlspecialchars (UrlDecode ($b [1])), "
n ";
$i + +;
}
?>
String Rawurldecode (String str)
Returns a string that is replaced by a sequence of percent semicolons (%) followed by a two-digit hexadecimal number in this string.
Example 1. Rawurldecode () example
Copy CodeThe code is as follows:
echo rawurldecode (' Foo%20bar%40baz '); Foo Bar@baz
?>
However, one thing to note is that UrlDecode () and Rawurldecode () decode the string is UTF-8 format encoding, if the URL contains Chinese words, and the page set is not UTF-8, then the decoded string to be converted to normal display!
Another problem is that the URL obtained is not the format of the%%nn N={0..F}, but the format of%unnnn N={0..F}, and the use of UrlDecode () and Rawurldecode () is not correctly decoded, but the following function to correctly decode ：
Copy CodeThe code is as follows:
function Utf8rawurldecode ($source)
{
$DECODEDSTR = "";
$pos = 0;
$len = strlen ($source);
while ($pos < $len) {
$charAt = substr ($source, $pos, 1);
if ($charAt = = '% ') {
$pos + +;
$charAt = substr ($source, $pos, 1);
if ($charAt = = ' U ') {
We got a Unicode character
$pos + +;
$unicodeHexVal = substr ($source, $pos, 4);
$unicode = Hexdec ($unicodeHexVal);
$entity = "the". $unicode. ';';
$decodedStr. = Utf8_encode ($entity);
$pos + = 4;
}
else {
We have an escaped ASCII character
$hexVal = substr ($source, $pos, 2);
$decodedStr. = Chr (Hexdec ($hexVal));
$pos + = 2;
}
} else {
$decodedStr. = $charAt;
$pos + +;
}
}
return $decodedStr;
}
http://www.bkjia.com/PHPjc/322095.html www.bkjia.com true http://www.bkjia.com/PHPjc/322095.html techarticle Here is a detailed explanation:///\\\ string UrlEncode (String str) returns a string in which all non-alphanumeric characters except-_ are replaced with a percent percent (%) followed by two ...
