<?php
mb_internal_encoding("utf-8");
$regexp = "/^\\s?(8|\\+\\s?7)((-|\\s|\\(|\\))*\\d(-|\\s|\\(|\\))*){10}$/";
$allNumbers = [
    $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']
];
$matches = [];
foreach ($allNumbers as $numbers) {
    foreach ($numbers as $number) {
        $correctText = str_replace(" ", "", $number);
        $correctText = str_replace("-", "", $correctText);
        $correctText = str_replace("(", "", $correctText);
        $correctText = str_replace(")", "", $correctText);
        $memeRegexp = "(\\+7)";
        $correctText = preg_replace($memeRegexp,"8", $correctText);
        if (preg_match($regexp, $correctText, $matches)) {
            echo "Правильный номер: {$matches[0]}<br/>";
        } else {
            echo "Ошибка! Введите номер формата: +7/8xxxxxxxxxx<br/>";
        }
    }
}


?>