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    IntlChar::tolower

    (PHP 7, PHP 8)

    IntlChar::tolower — Make Unicode character lowercase

    Descrição

    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.

    Parâmetros

    codepoint

    O valor int do ponto de código (por exemplo, 0x2603 para U+2603 SNOWMAN) ou o caractere codificado como uma string UTF-8 (por exemplo, "\u{2603}")

    Valor Retornado

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

    O tipo do retorno é int a menos que o ponto de código tenha sido passado como uma string UTF-8, neste caso uma string é retornada. Retorna null em caso de falha.

    Exemplos

    Exemplo #1 Testando diferentes pontos de código

    <?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")));
    ?>

    O exemplo acima produzirá:

    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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