Statement on glibc/iconv Vulnerability

    IntlChar::tolower

    (PHP 7, PHP 8)

    IntlChar::tolower — Make Unicode character lowercase

    Açıklama

    public static IntlChar::tolower(int|string $codepoint): int|string|null

    The given character is mapped to its lowercase equivalent. If the character has no lowercase equivalent, the original character itself is returned.

    Bağımsız Değişkenler

    codepoint

    int türünde Unicode karakter kodu (örn. U+2603 SNOWMAN için 0x2603) veya string türünde Unicode karakter kodu (örn. "\u{2603}")

    Dönen Değerler

    Returns the Simple_Lowercase_Mapping of the code point, if any; otherwise the code point itself. Returns null on failure.

    Unicode karakter kodu string türünde ise dönüş türü string, Unicode karakter kodu int türündeyse dönüş türü int olacaktır. Başarısızlık durumunda null döner.

    Örnekler

    Örnek 1 Farklı karakter kodlarının denenmesi

    <?php
    var_dump    (IntlChar::tolower("A"));
    var_dump(IntlChar::tolower("a"));
    var_dump(IntlChar::tolower("Φ"));
    var_dump(IntlChar::tolower("φ"));
    var_dump(IntlChar::tolower("1"));
    var_dump(IntlChar::tolower(ord("A")));
    var_dump(IntlChar::tolower(ord("a")));
    ?>

    Yukarıdaki örneğin çıktısı:

    string(1) "a"
string(1) "a"
string(2) "φ"
string(2) "φ"
string(1) "1"
int(97)
int(97)

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    User Contributed Notes 1 note

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    Patanjali
    3 years ago
    The other function I wrote to replace mb_strtolower may not work properly, as it erroneously equated graphemes with codepoints.

    tolower, like many IntlChar methods, works specifically on codepoints, so requires a codepoint iterator to isolate each.

    Also, because in tolower, if there is no lowercase version of the codepoint, the supplied one is returned, so there is no need to specially test for alphabetic codepoints before conversion.

    <?php
    function u_tolower($text=''){
    // if blank, return blank (don't waste CPU cycles)
    if($text==''){return'';}

    // create the codepoint break iterator to identify the start of each codepoint
    $iterator=IntlBreakIterator::createCodePointInstance();

    // load the text
    $iterator->setText($text);

    // using a parts iterator to extract each codepoint itself, convert and append it to the new string
    $newtext='';
    foreach(    $iterator->getPartsIterator() as $codepoint){$newtext.=IntlChar::tolower($codepoint);}

    // return converted text
    return $newtext;
    }
    ?>
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