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IntlChar::tolower

(PHP 7, PHP 8)

IntlChar::tolowerMake Unicode character lowercase

Açıklama

public static IntlChar::tolower(mixed $codepoint): mixed

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

Değiştirgeler

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.

Unicode karakter kodu string türünde ise dönüş türü string, Unicode karakter kodu int türündeyse dönüş türü int olacaktır.

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)

Ayrıca Bakınız

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User Contributed Notes 2 notes

up
0
Patanjali
1 year 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;
}
?>
up
-1
Patanjali
1 year ago
A function to convert a Unicode string to lowercase, directly replacing mb_strtolower, by converting one grapheme at a time:

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

// for each grapheme
$str='';
for(
$i=0;$i<grapheme_strlen($text);$i++){
 
// add to string if alpha, else as is
 
$char=grapheme_substr($text,$i,1);
 
$str.=(IntlChar::isalnum($char)?IntlChar::tolower($char):$char);
}

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