Intl versions of ucfirst/ucwords

intl-ucfirst-ucwords-implementation.php

<?php

function intl_ucfirst($str)
{
    $it = IntlBreakIterator::createCharacterInstance('en_US');
    $it->setText($str);
    $it = $it->getPartsIterator(IntlPartsIterator::KEY_SEQUENTIAL);
    
    $strstr= "";
    
    foreach($it as $offset => $char) {
        if (!$offset) {
            $char = IntlChar::toupper($char);
        }
        
        $strstr .= $char;
    }

    return $strstr;
}

function intl_ucwords($str)
{
    $words_it = IntlBreakIterator::createWordInstance('en_US');
    $words_it->setText($str);
    $words_it = $words_it->getPartsIterator(IntlPartsIterator::KEY_SEQUENTIAL);
    
    $strstr= "";
    
    foreach($words_it as $word) {
        $it = IntlBreakIterator::createCharacterInstance('en_US');
        $it->setText($word);
        $it = $it->getPartsIterator(IntlPartsIterator::KEY_SEQUENTIAL);
        foreach ($it as $offset => $char) {
            if (!$offset) {
                $char = IntlChar::toupper($char);
            }
            $strstr .= $char;
        }
    }

    return $strstr;
}

$str = "ãndre ǩurchavitz";
echo ucfirst($str), "\n", intl_ucfirst($str), "\n", intl_ucwords($str);

output.txt

ãndre ǩurchavitz
Ãndre ǩurchavitz
Ãndre Ǩurchavitz