PHPのお勉強！

PHP TOP
PHP 8.4.2 Released!

    rawurldecode

    (PHP 4, PHP 5, PHP 7, PHP 8)

    rawurldecode — URL エンコードされた文字列をデコードする

    説明

    rawurldecode(string $string): string

    文字列の中にパーセント記号 (%) に続いて 2 つの 16 進数があるような表現形式を、文字定数に置き換えて返します。

    パラメータ

    string

    デコードする URL。

    戻り値

    デコードされた URL を文字列で返します。

    例

    例1 rawurldecode() の例

    <?php

    echo rawurldecode('foo%20bar%40baz'); // foo bar@baz

    ?>

    注意

    注意:

    rawurldecode() は、プラス記号 ('+') をスペースに変換しません。urldecode() は変換します。

    参考

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 3 notes

    up
    22
    php dot net at hiddemann dot org
    19 years ago
    To sum it up: the only difference of this function to the urldecode function is that the "+" character won't get translated.
    up
    9
    Javier A. Segura at gmail dot com
    16 years ago
    Hi everybody =) My name is Javier and I'm from Argentina.
    I've had a little issue with latin characters like ñ","Ñ","á","é","í", etc.
    They are not decoded with rawurlencode(), so I've made this:
    <?php
    function urlRawDecode($raw_url_encoded)
    {
    # Hex conversion table
    $hex_table = array(
    0 => 0x00,
    1 => 0x01,
    2 => 0x02,
    3 => 0x03,
    4 => 0x04,
    5 => 0x05,
    6 => 0x06,
    7 => 0x07,
    8 => 0x08,
    9 => 0x09,
    "A"=> 0x0a,
    "B"=> 0x0b,
    "C"=> 0x0c,
    "D"=> 0x0d,
    "E"=> 0x0e,
    "F"=> 0x0f
    );

    # Fixin' latin character problem
    if(preg_match_all("/\%C3\%([A-Z0-9]{2})/i", $raw_url_encoded,$res))
    {
    $res = array_unique($res = $res[1]);
    $arr_unicoded = array();
    foreach(    $res as $key => $value){
    $arr_unicoded[] = chr(
    (    0xc0 | ($hex_table[substr($value,0,1)]<<4))
    | (    0x03 & $hex_table[substr($value,1,1)])
    );
    $res[$key] = "%C3%" . $value;
    }

    $raw_url_encoded = str_replace(
    $res,
    $arr_unicoded,
    $raw_url_encoded
    );
    }

    # Return decoded raw url encoded data
    return rawurldecode($raw_url_encoded);
    }

    print     urlRawDecode("%C3%A1%C3%B1");

    // output:
    // áñ

    ?>
    For example, you have the character "ñ" encoded like this "%C3%B1".
    This is nothing more and nothing less than 0xc3 and 0xb1,
    they are binary numbers, (HHHH LLLL, where HHHH=High and LLLL=Low).
    0xc3 = 1100 0011 (binary 8 bit word), 0xb1 = 1011 0001 (binary 8 bit word),
    To convert a raw encoded character to ascii we have to make boolean operations
    between this two operands (0xc3 and 0xb1), boolean algebra were defined by George
    Boole, we need to use them here. The first one we going to use is the
    logical OR ("|" or "pipe") and logical AND ("&" or "and person").

    A logical OR implies the following truth table:
    a b (a OR b)
    0 0 0
    0 1 1 (a OR b or Both, a and b, must be true to get a true result)
    1 0 1
    1 1 1

    A logical AND implies the following truth table:
    a b (a AND b)
    0 0 0
    0 1 0
    1 0 0
    1 1 1 (Both a AND b, must be true to get a true result)

    So, here we have to make a logical OR with both 0xc3 and 0xb1 HIGH nibble,
    a nibble is a half byte (4 bits), so we have to make a logical OR between
    1100 (0xc) and 1011 (0xb), we going to get this: 1111 (0xf), then we have to make
    a logical AND between both LOW nibble, 0011 (0x3) and 0001 (0x1), we going to get
    this: 0001, so, if we want to see the final result, we have to put HIGH and LOW
    nibble on his Byte position, like this: 1111 0001 (0xf1) and that is nothing
    more and nothing less than "ñ" (to check this out, try the following: print(chr(0xf1));).

    This "<<" is a logical shift left, if we have this binary number 0001 (1) and we make this:
    0001 << 2 we'll get 0100 (4) right bits are filled with 0's.

    <?php
    # Conversion example %C3%B1 to ASCII (0x71)
    print(
    chr(
    (    0xc0|0x0b<<4) | (0x03&0x01)
    )
    );

    // Output will be:
    // ñ

    // 1100 0000 OR 1011 0000 = 1111 0000 (0xf0)
    // 0000 0011 AND 0000 0001 = 0000 0001 (0x01)
    // 1111 0000 OR 0000 0001 = 1111 0001 (0xf1)

    ?>

    PS: I'm so sorry about my english, I know, is horrible :P
    up
    4
    jakub dot lopuszanski at nasza-klasa dot pl
    10 years ago
    Be aware that rawurldecode does not warn you in any way if the output is nonvalid UTF-8.
    For example if the input passed to the function is just "%C5", then since C is 1100 in binary, and UTF-8 characters starting with 110 should be followed by another character, the result of rawurldecode will be just a single byte (with value \xC5) which is not a correct UTF-8.
    Confront this with for example Javascript which will warn you about it:

    JAVASCRIPT:

    decodeURI("%C5")
    URIError: URI malformed

    decodeURIComponent("%C5")
    URIError: URI malformed

    unescape("%C5")
    "Å"

    PHP:
    var_dump(rawurldecode("%C5"))
    string(1) "▒"

    php -v
    PHP 5.3.6 (cli) (built: Oct 4 2012 10:19:07)
    Copyright (c) 1997-2011 The PHP Group
    Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies
    with Suhosin v0.9.32.1, Copyright (c) 2007-2010, by SektionEins GmbH
    ＋add a note
    To Top