<?php
header("Content-Type: text/plain; charset=utf-8");
error_reporting(E_ALL | E_STRICT);
 
$goodnumbers = array('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');
 
$badnumbers = array('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 +
);
 
$regexp = '/^\s?(8|\+[\s]?7)([\s()-]*\d){10}\s*$/';
echo "Проверяем правильные номера: \n";
 
foreach($goodnumbers as $value){
    if(preg_match($regexp, $value)){
        echo "Номер правильный {$value}\n";
    }else {
        echo "Номер неправильный  {$value}\n";
    }
}
 
echo "\nПроверяем неправильные номера: \n";
 
foreach($badnumbers as $value){
    if(preg_match($regexp, $value)){
        echo "Номер правильный {$value}\n";
    }else {
        echo "Номер неправильный  {$value}\n";
    }
}

PD9waHAKaGVhZGVyKCJDb250ZW50LVR5cGU6IHRleHQvcGxhaW47IGNoYXJzZXQ9dXRmLTgiKTsKZXJyb3JfcmVwb3J0aW5nKEVfQUxMIHwgRV9TVFJJQ1QpOwoKJGdvb2RudW1iZXJzID0gYXJyYXkoJzg0OTUxMjM0NTY3JywgJys3NDk1MTIzNDU2NycsICc4LTQ5NS0xLTIzNC01NjcnLCAnIDggKDgxMjIpIDU2LTU2LTU2JywgJzgtOTExLTEyMzQ1NjcnLCAnOCAoOTExKSAxMiAzNDUgNjcnLCAnOC05MTEgMTIgMzQ1IDY3JywgJzggKDkxMSkgLSAxMjMgLSA0NSAtIDY3JywgJysgNyA5OTkgMTIzIDQ1NjcnLCAnOCAoIDk5OSApIDEyMzQ1NjcnLCAnOCA5OTkgMTIzIDQ1NjcnKTsKCiRiYWRudW1iZXJzID0gYXJyYXkoJzAyJywgJzg0OTUxMjM0NTY3INC/0L7Qt9Cy0LDRgtGMINC70Y7RgdGOJywgJzg0OTUxMjM0NScsICc4NDk1MTIzNDU2NzgnLAogICAgJzggKDQwOSkgMTIzLTEyMy0xMjMnLCAnNzkwMDEyMzQ2NycsICc1MDA1MDA1MDAxJywgJzg4ODgtODg4OC04OCcsCiAgICAnODQ5NTFhMjM0NTY3JywgJzg0OTUxMjM0NTZhJywKICAgICcrMSAyMzQgNTY3ODkwMScsIC8vINC90LXQstC10YDQvdGL0Lkg0LrQvtC0INGB0YLRgNCw0L3RiwogICAgJys4IDIzNCA1Njc4OTAxJywgLy8g0LvQuNCx0L4gOCDQu9C40LHQviArNwogICAgJzcgMjM0IDU2Nzg5MDEnIC8vINC90LXRgiArCik7CgokcmVnZXhwID0gJy9eXHM/KDh8XCtbXHNdPzcpKFtccygpLV0qXGQpezEwfVxzKiQvJzsKZWNobyAi0J/RgNC+0LLQtdGA0Y/QtdC8INC/0YDQsNCy0LjQu9GM0L3Ri9C1INC90L7QvNC10YDQsDogXG4iOwoKZm9yZWFjaCgkZ29vZG51bWJlcnMgYXMgJHZhbHVlKXsKICAgIGlmKHByZWdfbWF0Y2goJHJlZ2V4cCwgJHZhbHVlKSl7CiAgICAgICAgZWNobyAi0J3QvtC80LXRgCDQv9GA0LDQstC40LvRjNC90YvQuSB7JHZhbHVlfVxuIjsKICAgIH1lbHNlIHsKICAgICAgICBlY2hvICLQndC+0LzQtdGAINC90LXQv9GA0LDQstC40LvRjNC90YvQuSAgeyR2YWx1ZX1cbiI7CiAgICB9Cn0KCmVjaG8gIlxu0J/RgNC+0LLQtdGA0Y/QtdC8INC90LXQv9GA0LDQstC40LvRjNC90YvQtSDQvdC+0LzQtdGA0LA6IFxuIjsKCmZvcmVhY2goJGJhZG51bWJlcnMgYXMgJHZhbHVlKXsKICAgIGlmKHByZWdfbWF0Y2goJHJlZ2V4cCwgJHZhbHVlKSl7CiAgICAgICAgZWNobyAi0J3QvtC80LXRgCDQv9GA0LDQstC40LvRjNC90YvQuSB7JHZhbHVlfVxuIjsKICAgIH1lbHNlIHsKICAgICAgICBlY2hvICLQndC+0LzQtdGAINC90LXQv9GA0LDQstC40LvRjNC90YvQuSAgeyR2YWx1ZX1cbiI7CiAgICB9Cn0=