<?php
 
error_reporting(-1);
header("Content-Type: text/plain; charset=utf-8");
 
$text = <<<EOF
Пocтaвкa мяco гoвядины, бecкостнoe для нужд государственного бюджетнoго
учреждения здравоохранения Республики Башкортостан Инфeкционная клиническая
больница № 4 города Уфа.
EOF;
 
function CheckingEnglishLetter($checkText)
{
    $check = '![a-z]!i';
    {
        $result = preg_replace($check, '[$0]', $checkText);
    }
    return $result;
}
 
$patterns = array(
    '0' => '!o!i',
    '1' => '!c!i',
    '2' => '!a!i',
    '3' => '!e!i',
);
 
$replacements = array(
    '0' => 'о',
    '1' => 'с',
    '2' => 'а',
    '3' => 'е',
);
 
echo "Исходный текст:\n{$text}";
 
$result = CheckingEnglishLetter($text);
echo "\n\nПоиск ошибок:\n{$result}";
 
$result = preg_replace($patterns, $replacements, $text);
echo "\n\nИсправленый текст:\n{$result}";
 
$result = CheckingEnglishLetter($result);
echo "\n\nДополнительная проверка (выделит ошибки):\n{$result}";

PD9waHAKCmVycm9yX3JlcG9ydGluZygtMSk7CmhlYWRlcigiQ29udGVudC1UeXBlOiB0ZXh0L3BsYWluOyBjaGFyc2V0PXV0Zi04Iik7CgokdGV4dCA9IDw8PEVPRgrQn29j0YJh0LLQumEg0LzRj2NvINCzb9Cy0Y/QtNC40L3Riywg0LFlY9C60L7RgdGC0L1vZSDQtNC70Y8g0L3Rg9C20LQg0LPQvtGB0YPQtNCw0YDRgdGC0LLQtdC90L3QvtCz0L4g0LHRjtC00LbQtdGC0L1v0LPQvgrRg9GH0YDQtdC20LTQtdC90LjRjyDQt9C00YDQsNCy0L7QvtGF0YDQsNC90LXQvdC40Y8g0KDQtdGB0L/Rg9Cx0LvQuNC60Lgg0JHQsNGI0LrQvtGA0YLQvtGB0YLQsNC9INCY0L3RhGXQutGG0LjQvtC90L3QsNGPINC60LvQuNC90LjRh9C10YHQutCw0Y8K0LHQvtC70YzQvdC40YbQsCDihJYgNCDQs9C+0YDQvtC00LAg0KPRhNCwLgpFT0Y7CgpmdW5jdGlvbiBDaGVja2luZ0VuZ2xpc2hMZXR0ZXIoJGNoZWNrVGV4dCkKewogICAgJGNoZWNrID0gJyFbYS16XSFpJzsKICAgIHsKICAgICAgICAkcmVzdWx0ID0gcHJlZ19yZXBsYWNlKCRjaGVjaywgJ1skMF0nLCAkY2hlY2tUZXh0KTsKICAgIH0KICAgIHJldHVybiAkcmVzdWx0Owp9CgokcGF0dGVybnMgPSBhcnJheSgKICAgICcwJyA9PiAnIW8haScsCiAgICAnMScgPT4gJyFjIWknLAogICAgJzInID0+ICchYSFpJywKICAgICczJyA9PiAnIWUhaScsCik7CgokcmVwbGFjZW1lbnRzID0gYXJyYXkoCiAgICAnMCcgPT4gJ9C+JywKICAgICcxJyA9PiAn0YEnLAogICAgJzInID0+ICfQsCcsCiAgICAnMycgPT4gJ9C1JywKKTsKCmVjaG8gItCY0YHRhdC+0LTQvdGL0Lkg0YLQtdC60YHRgjpcbnskdGV4dH0iOwoKJHJlc3VsdCA9IENoZWNraW5nRW5nbGlzaExldHRlcigkdGV4dCk7CmVjaG8gIlxuXG7Qn9C+0LjRgdC6INC+0YjQuNCx0L7QujpcbnskcmVzdWx0fSI7CgokcmVzdWx0ID0gcHJlZ19yZXBsYWNlKCRwYXR0ZXJucywgJHJlcGxhY2VtZW50cywgJHRleHQpOwplY2hvICJcblxu0JjRgdC/0YDQsNCy0LvQtdC90YvQuSDRgtC10LrRgdGCOlxueyRyZXN1bHR9IjsKCiRyZXN1bHQgPSBDaGVja2luZ0VuZ2xpc2hMZXR0ZXIoJHJlc3VsdCk7CmVjaG8gIlxuXG7QlNC+0L/QvtC70L3QuNGC0LXQu9GM0L3QsNGPINC/0YDQvtCy0LXRgNC60LAgKNCy0YvQtNC10LvQuNGCINC+0YjQuNCx0LrQuCk6XG57JHJlc3VsdH0iOw==