<?php
 
error_reporting(-1);
mb_internal_encoding('utf-8');
 
$regexp = '/^[(\+7)|(\+\s7)|(8)]$/';
$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 + */
];
 
function checkCorrectness($numbers, $regexp) {
$regexp = '/[(\\+7)|(\\+\\s7)|8][\\a\\(\\)\\-\\d]/';
 
foreach ($numbers as $value) {
	if (preg_match($regexp, $value)) {
		echo "{$value} - correct\n";
	}
		else {
			echo "{$value} - incorrect\n";
		}
	}
}
 
checkCorrectness($correctNumbers, $regexp);
echo "valid numbers end\n";
checkCorrectness($incorrectNumbers, $regexp);
echo "invalid end";
 

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