The difference between PHP urlencode and Rawurlencode _php tutorial

In PHP Rawurlencode and Rawurlencode are the characters are encoded, the following I will introduce UrlEncode and rawurlencode the difference, there is a need to understand the friends can refer to.

The purpose of UrlEncode is to encode a string, replacing all non-alphanumeric characters in the original string with all but "-_" as a percent sign (%) followed by a two-digit hexadecimal number, but note that the space is replaced by the + number for historical reasons. Rawurlencode in fact, like UrlEncode, is also used to encode strings, the only difference is that it uses RFC1738 encoding, which will replace the space with%20.

Their corresponding decoding functions are UrlDecode and Rawurldecode. Referring to the official website's description, UrlDecode decodes any%## in the encoded string given, plus (' + ') is decoded into a space character, and the Rawurldecode decodes the character string with a percent sign (%) followed by a two-bit hex. There are two differences, one is UrlDecode decoding is the percent (%) after any two characters will be decoded, for example,%MN will also decode, but will fail; Rawurldecode only the percent percent (%) after the two digits are hexadecimal (0-9a-f) characters will be decoded, Second, the UrlDecode will decode the + number into a space.

Let's look at two more functions in the official PHP introduction.

urlencode-encoded URL string

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String UrlEncode (String $str)
This function makes it easy to encode a string and use it for the request part of the URL, and it also facilitates the passing of a variable to the next page.

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Str
The string to encode.

Report a bug return value
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 (+).

The code is as follows	Copy Code
Example #1 UrlEncode () example Echo '; ?> Example #2 UrlEncode () and htmlentities () example $query _string = ' foo= '. UrlEncode ($foo). ' &bar= '. UrlEncode ($bar); Echo '; ?>

rawurlencode-encoding URLs according to RFC 1738

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String Rawurlencode (String $str)
The characters specified according to the» RFC 3986 encoding.

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Str
The URL to encode.

Report a bug return value
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 3986 to protect the literal characters from being interpreted as a special URL delimiter, while protecting the URL format from being confused by the transfer media (like some messaging systems) using character conversions.

Cases

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Example #1 include a password in the FTP URL Echo ' @ftp. Example.com/x.txt ' > '; ?> The above routines will output:

By the description of the decoding function on the face, it can be inferred that using UrlEncode or Rawurlencode encoding can be decoded using UrlDecode, but if the original string contains spaces, Strings that are decoded with UrlEncode encoded using Rawurlencode are different from the original string.

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