?php
 
error_reporting(-1);
mb_internal_encoding('utf-8');
 
$text = "ну что.      не смотрел еще black mesa.я собирался скачать  ,но все как-то некогда было.";
// Для тестов
// $text = 'roses are red,and violets are blue.whatever you do i'll keep it for you.';
// $text = 'привет.есть 2 функции,preg_split и explode ,не понимаю,в чем между ними разница.';
 
 
function makeFirstLetterUppercase($str)
{
    //ucfirst ( $text ); не юзает кириллицу
 
    // $str = mb_strtoupper($str);   не работает, впрочем также как и конверт_кейс
    $str = mb_strtoupper(mb_substr($str, 0, 1) . mb_substr($str, 1, NULL));
 
    return $str;
    //echo gettype($str);
 
}
 
//пока не делал фикс, но не думаю что это сложно
function fixText($text)
{
    $text = preg_replace('/\s{2,10}/u', "", $text);
 
}
 
$vartext = array();
$vartext = preg_split('/(?<=\.)(\s+|)/u', $text, -1, PREG_SPLIT_NO_EMPTY);
 
//var_dump($vartext);
foreach ($vartext as $stringsLetters) {
 
    echo "без изменений - ";
    echo $stringsLetters;
    echo "\n \n";
 
    echo "тут должна быть большая буковка - ";
 
    echo $stringsLetters = makeFirstLetterUppercase($stringsLetter);
    echo "\n\n ";
    //  var_dump( $stringsLetters);
 
    //  echo "\n";
 
}

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