/*На вход скрипта дан введенный пользователем номер телефона в виде 8-911-404-44-11 или +7(812)6786767 (
в начале 8 или +7, потом идут 10 цифр и, возможно, какие-то символы). То есть, как и в прошлой задаче,
человек вводит номер как хочет. Надо проверить номер на правильность и привести любой номер к единому
формату 89114044411 (то есть, заменить +7 на 8 и выкинуть весь мусор вроде пробелов, скобок и минусов, кроме цифр)*/
<?php
 
$correctNumbers = [
    '84951234567', '+74951234567', '8-495-1-234-567',
    ' 8 (8122) 56-56-56', '8-911-1234567', '8 (911) 12 345 67',
    '8-911 12 345 67', '8 (911) - 123 - 45 - 67', '+ 7 999 123 4567',
    '8 ( 999 ) 1234567', '8 999 123 4567'
];
 
 
$incorrectNumbers = [
    '02', '84951234567 позвать люсю', '849512345', '849512345678',
    '8 (409) 123-123-123', '7900123467', '5005005001', '8888-8888-88',
    '84951a234567', '8495123456a',
    '+1 234 5678901', /* неверный код страны */
    '+8 234 5678901', /* либо 8 либо +7 */
    '7 234 5678901' /* нет + */
];
 
$regex = "/^\s*((\+\s*7)|8){1}(\W*\d){10}$/u";
 
echo "Correct numbers.\n";
foreach ($correctNumbers as $correctNumber) {
    if (preg_match($regex, $correctNumber)) {
        echo "Regex is correct for $correctNumber!\n";
        $replaces = preg_replace("/^(\+\s*7)?/", "8", $correctNumber);
        $replaces = preg_replace("/\D/u", "", $replaces);
        echo $replaces . "\n";
    } else {
        echo "Regex doesn't work with $correctNumber.\n";
    }
}
echo "Incorrect numbers.\n";
foreach ($incorrectNumbers as $incorrectNumber) {
    if (preg_match($regex, $incorrectNumber)) {
        echo "Regex is correct for this one!\n";
    } else {
        echo "Regex doesn't work with $incorrectNumber.\n";
        $replaces = preg_replace("/^(\+?\s*7)?/", "8", $incorrectNumber);
        $replaces = preg_replace("/\D/u", "", $replaces);
        echo $replaces . "\n";
    }
}

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